K107_BORG+MAN

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K107 BORG+plus PROBE.2 Geiger Counter by Atomic.dave [email protected]

This is a one of a kind custom hand-made Geiger Counter built by Atomic.Dave. It is based on a kit de-signed by the original creator of the DIY Arduino based Geiger Counter Kit- Brohogan. For over 3 years, Ihave built and sold over 100 of these kits, with very good results, and fantastic feedback by ebay customers.All information for this kit is available at the developer’s website and its a good idea to visit the site from timeto time as the software and other parts of it may change, upgrade or improve. As I have said before, this ismore of a kit for someone who knows a little bit about electronics but doesn’t have the time or patience tobuild it, or would rather someone else do all the dirty work. Having been built by me, of course there will besome imperfections, although as minimal as possible. These instructions willhelp you to understand the basic operation of this meter. Once you haveused it a couple times, it should be pretty easy for you to operate.

OPERATIONOn the face of the unit starting from the top are 3 vent holes, LCDbacklit display, 2 LEDS, then 2 momentary buttons, and 4 triple poleslide switches. Follow the label to locate the listed switches below:

VENTS (Three grilled holes just above the display)Under these grills are the event piezo where the sound comes out for every radiation event. Also located thereis the IR for the wireless remote control, so when operating the remote, try to aim it to this general location.Last on the right is the piezo for the Alarm.

LEDSAfter powering the GC on, you will hear the beeping of the piezo as one of the probes you have attachedpicks up radiation events. The GREEN LED is for radiation events and coincides with the beeping piezowhich can be muted with the SND switch. The RED LED will only light up when a set alarm threshold isreached. The piezo for the alarm and events are located beneath the grilled vents above the display. BothLEDS can be turned off for indiscreet radiation monitoring. The two switches for this operation are the two inthe center of the four. LTS and ALM Middle postion is off.

SWITCHESA. MODmomentary switch (first black tactile button on the left) does 4 things. 1- Alarm control. 2- Scaler modestart/stop. 3- Alarm 30 second mute. 4- Menu reset.

1.When you first power on the unit, you will see:Atomic.dave K107

BORG+plus v10.3C

This customized first welcome window can easily be changed if you want, by doing a little programming in Ar-duino. Refer to the ARDUINO section for more detailed instructions. But the default is now set to my name, Kit 107,and the second line has the meter name and the version of software that the AT328 chip is running which is v10.3C.

Then a second window will come up with the first line showing the current set uSv to CPM conversion rate.345 CPM=1 uSv/h

Running at 5.24V

The second line refers to the current voltage that your system is running at. This is a 5 volt system. The3200mAh 3.7v lipo battery is boosted to 5v with a pololu booster. Everytime you start up your GC (geigercounter) it will show you this so you will always know your current voltage.

The third window will show this:Alarm Set ?

Now at 500 CPM

At this point, you can push the MOD button to incrementally change the Alarm threshold number. Onceyou stop holding down the button and wait, it will be set to the current number shown on the screen and willstay there until you change it either again restarting and waiting for this part, or by using the included remotecontrol to change it. You can also choose from units of measurement such as CPM or uSv/h for the Alarmwith the remote.

2. It also acts like a stopwatch starter for the scaler mode. It has two preset times of 1 minute and 10 minuteaveraging. You can change this with the remote, or the sketch when connected to pc. Although it is much easierwith the remote obviously. Push the button and the timer starts where the first line is counting down from 60 sec-onds. The numbers on the left are the current total events during this timed one minute. The numbers on the rightis the seconds counting down from 60 to 0. Same thing goes for the second line, but for 10 minutes.

3.When your alarm goes off you can tap this button to mute the alarm for 30 seconds. 4. After programming your unit with the wireless remote, if you want to reset it to default settings. Hold

down this button while the unit starts up.

USB Power& ChargeSwitch

Audio Out

USB Port &Charge Status LED

LCD ContrastAdjustment Pot

CI-8B Toggle Position

LND7317 Toggle Position

HV Toggle &Adjustment Pots

BNCCI-8B

+ –LND7317

HVMeasure Pts.

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B. PWR Power switch controls the power and charging of the GC. Up turns it on the GC with battery power,Middle turns it off, and Down position is for charging the unit. To charge the GC, push down the USB powerswitch on the left side of the GC, as well as have the PWR switch down. When you do this, a RED LED to theright of the USB port will remain constant RED while charging, and will turn BLUE when charging is com-plete. If you wish to power the unit with the USB in, and bypass the batteries for extended periods, put thePower switch in the middle position, and push the USB power switch UP. Always keep the USB power switchin the middle (OFF) when powering the unit with the batteries.C. LTS This is the Light switch that controls both the GREEN Event LED and the LCD Backlight. Up turns onboth, Middle turns both off, and Down turns on just the LED, and turns the Backlight off for power saving. D. ALM The Alarm switch controls the Alarm RED LED and Piezo. Up for both on, Middle for both off, andDown for LED only on. This makes for a silent visual alarm.E. SND The Sound switch controls the Event speaker. Up for tone mode, Middle for mute, and Down forStandard Click Mode. More on Tone Mode later.F. NULL The black tactile button (located on the side to the right of the SOUND switch) is used in "ToneMode" where clicks are replaced by a tone which varies in pitch based on the CPM. When pressed, a newbaseline is created for the pitch so if you are moving to an area with a higher background the pitch will still in-dicate changes at the new level.

DISPLAY IN DEPTH:

The top line shows the CPM (updated every 5 sec. by default) and a quick response bar graph (updated20 times / sec.). The bargraph will be replaced with “ALARM” if the displayed CPM exceeds the alarm thresh-old. It is also replaced by Vcc when it drops below 4.2V. The second line shows the dose unit and the calculateddose. The dose unit and the dose ratio (CPM to dose unit) are settable in the menu (controlled by the wirelessremote or via arduino). Pressing the Select button while in this screen will switch to the Scaler screen . . .

Two scalers are provided, each with its own period. The scaler on the top line is fixed at one minute andthe scaler on the bottom line is set to a programmable period from the menu. Each scaler has two modes -counting and ongoing. The screen on left shows both scalers counting. A running total of the counts is dis-played, along with the amount of time left for the scaler period. The screen on the left shows that the oneminute scaler finished the counting mode and is now showing the average CPM and dose rate for the period.These values now become a moving average. The bottom scaler can also be set to "Infinity" in the menu bysetting it below 2. This is a special mode that shows the total accumulated dose since the scaler screen wasfirst started. Pressing the Select button while in the scaler screen will bring you back to the main screen.However both scalers will still be accumulating counts, so you can go back and forth between the mainscreen and the scaler screen and still see meaningful data.

OTHER SWITCHES, BUTTONS, PORTS, DIALSA. Just to the right of the NULL button is the LCD contrast dial. As the LCD is used, it might get to a

point for you to readjust the contrast for it. Not a big deal, while the backlight is on, gently take a small screw-driver and turn it to the left or right until it appears to have the best contrast.

B. Located on the left lower side is the audio OUTPUT multi-port used for Geiger Bot (with the included G-Bot cable) Just plug in the Geiger Bot cable into this with the 3 conductor plug, and the 4 conductor into youriphone or ipad. It also serves as a mono audio output for silent listening with headphones, or with any 3 con-ductor to 3 conductor M-M audio cable, you can run sound based data logging software or amplify the clicking.

C. Just to the left of the MOD switch is the USB power and charge control switch. If you want to power the GCwithout using the batteries- 1. Turn off the GC battery by switching PWR to middle position. 2. plug in the USBcable, and other end to any 5v source such as a wall charger, cigarette adapter, pc, mac or laptop usb output. 3.Flip switch to the Up position. To charge the GC- 1. Push PWR switch down to CHARGE position. 2. Plug into USBsource. 3. Push USB switch to the down position. When you do this, a RED LED comes on to the right of the USBport and will remain RED till it is done charging, then the RED LED will become BLUE. During normal operationwith battery, keep this switch in the middle position.

D. On the lower right side is the Mini USB FTDI output/input for programming in Arduino. This also is usedto charge the internal Lithium Ion battery (with the power switch in the bottome position.) Or it can be used topower the GC for extended periods, however when you power it this way, I would advise to turn off the LCDbacklight. But its ok to turn it on once in a while, but I wouldn’t leave it on for extended periods. When uploadingany new changes to the program sketch, you will need to have the USB PWR switch in the up position white itis plugged into your pc with the USB cable. This same USB is used for an output to two different usb basedFREE Radiation Logging softwares. Both are PC based and not available for mac. http://radmon.org/ orhttp://radiohobbystore.com/radiation-logger/

E. NEW High voltage toggle switch. Since this meter is equipped with a BNC connector, it also has twopreset high voltage settings. Both of them also have fine tuning pots for each. So they can be adjusted up ordown to increase or lower the high voltage. Left position is preset to 375v and right position is set to 530.

F. NEW High voltage measuring points. The two small holes to the left of the BNC connector on top of theunit are for measuring high voltage for each of the toggled settings, using the included leads with the aligatorclips attached to your own multimeter. Negative is located nearest the bnc and positive is the other. There is al-ready a 1G ohm resistor inline with the postitive side, so just hook up to your meter and measure.

SCALER SCREEN

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REMOTE CONTROL SYSTEMThis adds some conveniences such as the ability to adjust certain things on the GC without the need to plug into your PC or mac. It is al-

ready setup to work. All you have to do is point the remote towards the IR window (above the display behind the steel speaker grill), and push thepower button on the remote to start. As soon as you do that these options will pop up. Use the channel button to move thru each option, and usethe volume buttons to move up or down within those options. You can also use the number pad to input numbers rather than using the up down ofthe volume. After you reach the desired amount you push ENT to enter it into the system.

The keys on the SONY Remote Control perform these functions:GREEN POWER BUTTON – enter or exit the menu system. "DISP PERIOD (MS)” is the first prompt you will see.CH + – moves to the next menu optionCH – – moves to the previous menu optionVOL + – increments the value already set for the current option or toggles an optionVOL – – decrements the value already set for the current option or toggles an optionENT – finalizes the entry in the current menu option if changes were made. When used out of the menu, it acts like the "null" button to reset the tone.Digits 0-9 – for direct entry of values (instead of Volume or Arrows) – must use Enter after using digits.Decimal Point - enters a decimal point - used when setting the ratio.Mute – used when out of the menu – mutes the speaker

MENU OPTIONSInitially, the menu options are set to defaults. Settings made will be stored in EEPROM on the ATmega328, so they will be in effect when youpower back on. Pressing and holding the Select button at power on will reset all menu settings back to their default settings. Here's a brief de-scription of each menu option along with its default setting: DISP PERIOD (MS) - The number of milliseconds before the display refreshes. 5000 (5 sec.) is a good setting.(Display counts are based on a "running average" I do not recommend settings of less than 5 seconds.)LOG PERIOD - Interval to write the CPM, 'dose', and MCU voltage to the serial output. Default = 1 minute Zero means logging is turned off.CPM->[DOSE] RATIO - Sets that ratio for the type of GM tube used. Default = 175.43 CPM and 100 CPM to dose unit (uSv) Note this ratio will dependon the dose unit being displayed - see DOSE UNIT. Also note that 2 ratios can be stored. The second ratio can be selected by the Tube Switch. De-pending on the position of the switch this menu option will set the value for either the 1st or 2nd ratio. 175.43 is the common default for the SBM-20 and100 for the LDN 712. The DEC PNT or AV/TV key on the remote can be used to enter a decimal point.ALARM THRESHOLD - When the CPM or DOSE units is greater than this value the alarm is triggered. Default = 500 CPM This can be either inCPM or the dose unit selected – see ALARM UNIT. Zero means the alarm is turned off. Unlike using the Select button, any value may be en-tered. The alarm will stop when activity drops back under the alarm threshold. You can also silence the alarm for 30 seconds by pressing the Se-lect button when the alarm is sounding.DOSE UNIT - Use the arrow keys to select the name of the unit for the dose value - "uSv/h", "uR/h" or "mR/h". Default = uSv/hALARM UNIT - Sets whether the alarm is based off of CPM or the DOSE unit. Use the arrow keys to select. Default = CPMSCALER PER (MIN) - Sets the period for the second scaler. Default = 10 minutes If scaler period set to "Infinite" (setting below 2) , the accumu-lated dose rate is displayed on the scaler screen.BARGRAPH MAX CPM - Sets the CPM that will give a full scale reading on the bar graph. Default = 1000 CPM Also see the Tone Mode sectionfor how this option affects tone mode.TONE SENSITIVITY - Determines how sensitive the tone is to changing activity. Default = 4 Low numbers are more sensitive. (see below)USE RADLOGGER? - When "Yes" serial output is compatible with Radiation Logger and RadLog applications. Default = OFFREG. VOLTAGE - Displays the voltage powering the MCU (Vcc). To a large degree, this represents the state of the battery.Note that each menu setting has a minimum and a maximum setting. Entries that are out of bounds will revert to the minimum or maximum.

ABOUT DOSE UNITSThe menu allows you select the name of the dose unit that appears on the display. However, to be clear, there is no built in conversion betweenthem. Instead the CPM->(unit) is adjusted depending on the name of the DOSE UNIT selected. For example, 175.43 is the default set for theSBM-20 with uSv as the dose unit. Suppose you pick "mR" as the dose unit name, and want to measure in milirems. ("mR" more correctly abbre-viates as milliroentgens but is used to save display space.) The rem is defined as .01 seivert, and 1uSv = 0.1mR. Therefore, to use the same ratiothat was designed for the tube, you would multiply that ratio by 10. You would enter a CPM->(unit) as 175.43 x 10 or 1754.3. Likewise if youwanted microrems ("uR") you would divide the ratio by 10 and enter 17.54.If you do want to use roentgens ("exposure" - used in older instruments) this source states that they are .96 rem in soft tissue. So the CPM->(unit) for actual mR would be 175.43 x 10 x .96 or 1684.1. (for uR it would be 16.84)

TONE MODEInstead of the usual 'clicks', tone mode produces tones that vary in frequency with the current activity - much like a metal detector. There is alsoan associated "null" button that resets the scale to the current activity. Tone mode is very responsive to changes in activity, and the change inpitch is much more noticeable than a change in the rate of clicks. It was primarily designed for field surveying. The sensitivity of the tone mode isset by the TONE SENSITIVITY menu option. Sensitivity refers to the 'bandwidth' of the tone. When set to low numbers, say 4 (the default) only asmall increase in activity is needed to produce higher tones. When dealing with more sensitive GM tubes, decrease the sensitivity by using avalue of say 8 or 10. Experiment with values that suit your ear.

The BARGRAPH MAX CPM menu setting also affects tone mode by defining the CPM that will produce the highest frequency of tone. Normallythis is set to highest CPM for situation and tube being used. In order to get the best spectrum of tones, tone mode is based on a logarithmic pro-gression rather than a linear one. This fits with the fact that radiation intensity is inversely proportional to the square of the distance from thesource. The "null button" resets the range of tones so that the low notes are set back to the current activity. This is a useful feature when switchingfrom a low to a high background for instance. The null button removes the higher background so increased activity may be more easily discerned.

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SETTING UP TONE MODE1. Set the proper conversion ratio for your tube. With the proper ratio set, the null point will automatically be set when the counter is powered onso normal background radiation is ignored. 2. Place a sample of the mineral or other radioactive item you are trying to detect approximately oneinch from the detector. Note the CPM reading after it has stabilized. 3. In the menu, set the BARGRAPH MAX CPM to the CPM value you notedin step 2. 4. Adjust the tone sensitivity setting to suit your preferences. For most mildly radioactive items (such as red Fiestaware), sensitivity set-tings from 1-5 work well. The ideal value varies depending on the activity level of the target object, the tube, and the distance. Lower settingscause the tone to increase in frequency faster in response to smaller changes in the count rate. Higher settings cause the frequency to increasemuch more slowly for changes in count rate. When the sensitivity setting is 0, the frequency will jump very rapidly from the lowest frequency tothe highest one. This setting is useful to quickly scan an area to determine if there are hot spots. You will likely want to change the setting to ahigher number to help locate the hot spot.

LOGGINGLogging is provided in the form of serial output through the FTDI connector at 9600 baud, N,8,1. The frequency to send the serial output is deter-mined by the LOG PERIOD menu setting.

The default format has a header on the first line with each line of data in comma separated values for CPM, Dose. and Vcc. For example,36,0.2052,4.79<CR/LF> (36 CPM, 0.2052 dose, 4.79V) When USE RADLOGGER? is set, no header is created, and only CPM is output. Thissetting is used when connecting the serial output to the Radiation Logger application.

SOFTWARE SWITCHESIf you are willing to load the software, modify it, and upload it, you can set #defines to change certain behavior or add special features to the pro-gram. In general all the common features are enabled and you don't have to mess with it. But if, for example, you want to use a 2x8 LCD, you sim-ply change a #define, and upload the new release.

All user based #defines are located at the beginning of the sketch and may change based on the version. Below is a list of the most interestingdefines in the current version.

• EIGHT_CHAR - formats for 2x8 LCD when true• DOGM_LCD -DogM LCD used for display (SPI interface)• IR_RC5 - use Phillips RC5 IR protocol instead of Sony• ANALOG_METER - support for analog meter output - REQUIRES HARDWARE - see this project• TONE_POT_ADJ – if set, a 100kΩ pot can be used to set TONE SENSITIVITY instead of the menu option.• SELF_TEST - adds one to each counter every 167ms - simulates a ~360CPM count

There are step by step instructions on installing the Arduino IDE and uploading new software.

GEIGER BOT SUGGESTED SETTINGS: (You may have to play with it to get it just right) GO TO: https://sites.google.com/site/geigerbot/

ARDUINO Software and Serial-USB connection information:ON the cd you will find the FTDI driver and Arduino program version 1. Install both and restart your mac. Copy the Geiger Sketch folder to thesame folder as your Arduino program is and remember where that is as that will be where you go to save your sketch everytime you make achange to it. There will also be a Library folder that will also need to be in the same folder. Just remember that the folder has to be the same exactname as the sketch name is. And also within Arduino, you will have to go to preferences and show Arduino where your default sketch folder is.

ARDUINO SETTINGS: Brohogan Software system version 10.3C1. Open Arduino2. Open the saved sketch .ino file, connect your Geiger counter to the USB with power switch off.3. Verify the file by clicking the little check mark icon.4. Click TOOLS, and Select Board type as Arduino UNO, and select serial port as the top tty choice.5. Click Serial Monitor (top right looking glass icon). Set Baud rate to 9600 and you should see the CPM, uSv and geiger counter voltage data comingup once per minute.For more info go to website under Software section on the DIY geiger counter website. Or go to Arduino.cc

Select options Select Geiger Counter Select LND712 CS137 Adjust Conversion factor to your tube:

123 for LND712175 for SBM-20

360 for LND7317Select I/O Settings

Auto Adjust OFF(you may need to play

with this setting) RMS Window 1

Delay Window 30Volume Thresh 20000

Ultrafast Rates ON

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Measuring the HV:It's a bit tricky to measure the high voltage. The GM tube needs a lot of voltage but only a tiny amount of current. So the HV circuit only needs toprovide a very tiny current, and that's what it does. This is good because the battery will last longer - and it won’t kill you! However, it makesmeasuring the high voltage a bit more complicated.

When measuring voltage, a typical DVM will put a load on the circuit it's measuring of about 10MΩ. This load is far too much for the tiny amountof current available, and the DVM will read much lower than the actual voltage. A meter with a 10MΩ input impedance may read 214V when thevoltage is closer to 420V. You need at least a gig-ohm (1000MΩ) of input impedance to get accurate values of the HV for Geiger circuits.

One way to increase the input impedance of your DVM is to put large resistors in series with the probe and multiply the reading you get. Adding 910MΩ resistors in series adds 90MΩ. If you want a full gig-ohm of input impedance, it's best to just buy a single 1GΩ resistor (I HAVE IN-STALLED THIS INSIDE YOUR GC). Once you have the resistors added in series with the meter, you have to multiply the reading by some factor.

The formula for this is:(Rprobe + Rmeter / Rmeter) X Vreading = Vactual voltage

If you used a 1GΩ resistor (1000MΩ) with this meter it would be 1000 + 10 / 10 = 101 so you’d multiply your reading by 101.

So with this in mind with the installed 1G ohm resistor, all you will need to do is first plug in the provided HV leads into the tiny holes at the top of theGC, then attach the other to the multimeter leads with the aligator clips. RED to RED, and BLACK to BLACK. If the toggle is to the right, then usingthe jewelers screwdriver, turn the right side pot screw clockwise to increase voltage, and counterclockwise to decrease voltage. I have preset it sothat the toggle in right position is higher for the LND probe at around 500 volts, and in left position, lower for the CI probe at about 375 volts.

Meter Reading Voltage Amount Probe5.15 520 LND 73173.7 375 CI-8B

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PLEASE REFER TO THE DIY GEIGER COUNTER DEVELOPERSWEBSITE FOR FURTHER INFORMATION:http://www.sites.google.com/site/diygeigercounter/

HARDWARE1. DIY Geiger counter kit V5.3 by Brohogan, V10.3C2. Power System by Panasonic, Sparkfun and Pololu (please chargethe unit until the RED light turns BLUE)A. You can power the Geiger in a couple different ways 1. With internal Lipo battery2. With PWR switch OFF (middle), USB cable plugged into USBport on bottom panel of GC then plugged into:

a. Computer or laptop USBb. Wall charger block- This is the fastest way to charge the battery.c. Standard 5v USB Cigarette adapter d. To power and operate the unit this way for long periods, I wouldsuggest to TURN OFF BACKLIGHT to conserve the life of the LCD.

POWER and OTHER SYSTEM ITEMS: This system is capable ofproducing 900+ volts, so be careful or you may get zapped whenhandling the system while it is powered on.

A. Panasonic Lithium Ion battery - 3.7v 3400mAh• Full charge provides approximately 20 hours constant useof geiger counter with backlight off.• Charge with PC/USB will take about 5 hours or more.

B. USB Lithium Polymer battery chargerC. Pololu 5V Step-Up Voltage Regulator U1V10F5http://www.pololu.com/product/2564

D. Sparkfun 5V FTDI Basic Breakout

ENCLOSURE: Serpac H75 Dimensions: 182.9mm X 92.7mm X 30.5mmhttp://www.serpac.com/h75.aspx

REPAIRS:If the unit fails for some reason within 6 months of purchase, I will bemore than happy to do any maintenance you need at no charge except forparts and shipping.

PACKAGE CONTENTS:BORG Geiger Counter with BNC, HV toggle, 2 probes- LND7317 and CI-8B, Lead Pig w/ Sample, Sony RM-EZ4 Remote Control, (4) Cables: (2)BNC, Geiger bot 3 to 4 conductor, Mini USB to standard USB2. Wall andCar chargers. CD with program sketch, photos, documents, Manual,RAD sticker, and extra faceplate labels. FREE UV keychain flashlight withbatteries while supplies last.

LND 7317GENERAL SPECIFICATIONSGas filling Ne +HalogenCathode material Stainless SteelMaximum length (inch/mm) 3.00/76.1Effective depth (inch/mm) 0.5/12.7Maximum diameter (inch/mm) 2.11/53.6Effective diameter (inch/mm) 1.75/44.5Connector Grid CapOperating temperature range °C -40 to +75WINDOW SPECIFICATIONSAreal density (mg/cm²) 2.0Effective diameter (inch/mm) 1.75/44.5Material Mica

80mm

30mm

65mm

mica window

10mm16.5mm

70mm

PANCAKE 7317 (@1/8” distance)

C 53000S 70000 B 35

3

ELECTRICAL SPECIFICATIONSRecommended anode resistor (meg ohm) 4.7Maximum starting voltage (volts) 425Recommended operating voltage (volts) 500Operating voltage range (volts) 475 - 675Maximum plateau slope (%/100 volts) 10Minimum dead time (micro sec) 40Gamma sensitivity Co60 (cps/mr/hr) 60Tube capacitance (pf) 3Weight (grams) 125Maximum background shielded

50mm Pb + 3mm Al (cpm) 30Minimum anode resistor (meg ohm) 3.3

RUSSIAN GEIGER TUBE COUNTER CI-8BThe slope of the plateau of the counting characteristics,%, not exceeding: 0,3Sensitivity of the counting rate, imp.s-1.A-1.kg: 1.3 * 10E12 ... 1.9 * 10E12Sensitivity of the counting rate (imp / uR): (350 – 500)The slope of the voltage-current characteristics,%, not more: 1,25Amplitude voltage pulse, V, no less than: 20Own background, imp / s, max: 2Effectiveness of registration of beta radiation,%: 50 – 85Current sensitivity, uA: 8 – 15 (at P = 12.9 * 10E-10 A / kg (5 uR / s))Operating range voltage, V: 360 – 440Maximum operating speed counting, pulses / s: 3400Maximum operating current, mA: 18.2The maximum permissible exposure dose of gamma radiation, A / kg: 21.5 * 10E-6 (for 1 min)The maximum permissible exposure dose of gamma radiation (R / h): (300) (for 1 min)

THE GEIGER KIT IS NOT INTENDED TO GUIDE ACTIONS TO TAKE, OR NOT TO TAKE, REGARDING EXPOSURE TO RADIATION. THE GEIGER KIT AND IT'S SOFTWARE ARE FOR EDUCATIONAL PURPOSES ONLY. DO NOT RELY ON THEM IN HAZARDOUS SITUATIONS!

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