Analyzing Radioactive Nuclides of the Soil in NTHU

ANALYZING RADIOACTIVE NUCLIDES OF THE SOIL IN

NTHU BY HIGH PURITY GERMANIUM DETECTOR

Speaker : Shirlen TsaiBiomedical Engineering and Environmental Sciences,

NTHUInstructor : Li-Jih Yuan

OUTLINE Introduction Material and Method

HPGeSampling Preparation and Measurement

ResultEnergy PeaksComparison of Counting Rates

Conclusion Study Plan

INTRODUCTION Primordial radionuclides : 235U,

238U, 232Th, 40K Anthropogenic radionuclide : 137Cs

MATERIAL AND METHOD HPGe

High energy resolutionRelatively high efficiency

http://www.canberra.com

MATERIAL AND METHOD• Sampling Preparation and Measurement

RESULT-ENERGY PEAKSSample 1.BST front 2.BST back 3.HS Lake 4.DormS 5.CHE 6.TSMC 7.Reactor1 8.RadioLab 9.Reactor2 10.BackgroundTime CTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rateCTS counting rate

Energy(keV)Nuclide128.8(Ac-228[2.9%]) 0 0 205 0.00329291 534 0.00702835 429 0.00573744 714 0.00996553 1743 0.008715 633 0.007115 632 0.00385665 0185.8(Ra-226?[3.3%]) 1056 0.01567231 1761 0.01761 984 0.01580596 1882 0.02477033 1400 0.01872359 1672 0.02333664 4589 0.022945 1936 0.02176088 2974 0.0181482 845 0.004225209.2(Ac-228[4.6%]) 894 0.01326803 928 0.00928 670 0.01076219 807 0.0106215 790 0.01056545 1115 0.01556241 2783 0.013915 1270 0.01427496 1765 0.01077054 0238.65(Pb-212[43%]) 6638 0.09851588 10561 0.10561 5253 0.08437876 8678 0.11421727 7637 0.10213716 10436 0.14565858 28172 0.14086 12632 0.14198523 16040 0.09788068 525 0.002625270.2(Ac-228[3.8%]) 572 0.00848917 847 0.00847 587 0.00942896 649 0.00854195 561 0.00750281 939 0.01310592 2185 0.010925 1111 0.01248778 1445 0.0088178 0277.3(Tl-208[6.5%]) 0 0 475 0.00762991 384 0.00505409 352 0.00470764 563 0.00785797 963 0.004815 471 0.0052941 593 0.00361866 0295.4(Pb-214[19%]) 1552 0.02303354 2478 0.02478 1381 0.02218296 2011 0.02646819 1566 0.02094367 2239 0.03125044 6160 0.0308 3049 0.03427113 4037 0.02463493 0300.2(Pb-212[3.3%]) 555 0.00823687 809 0.00809 427 0.00685889 662 0.00871305 500 0.006687 779 0.01087275 1878 0.00939 956 0.01074556 1023 0.00624264 0328(Ac-228[3.3%]) 0 684 0.00684 332 0.0053329 520 0.00684409 440 0.00588456 678 0.00946306 1542 0.00771 746 0.00838513 917 0.0055958 0

338.2(Ac-228[12%]) 396 0.00587711 2268 0.02268 1074 0.01725163 1837 0.02417805 1553 0.02076981 2181 0.03044091 5974 0.02987 2772 0.03115762 3281 0.0200216 0351.8(Pb-214[37%]) 1512 0.02243989 4251 0.04251 2299 0.03692876 3179 0.04184106 2723 0.03641738 3955 0.05520119 10665 0.053325 4972 0.05588589 7283 0.04444295 576 0.00288409.5(Ac-228[2.2%]) 2797 0.04151083 0 0 0 334 0.00446691 408 0.00569459 818 0.00409 325 0.00365304 407 0.00248363 0462.6(Ac-228[4.6%]) 449 0.0066637 695 0.00695 320 0.00514015 567 0.00746269 430 0.00575082 700 0.00977012 1761 0.008805 769 0.00864365 862 0.00526017 0477.6(Ac-228[.24%]) 0 0 0 0 0 0 731 0.003655 0 372 0.00227005 0511 2126 0.03155239 3489 0.03489 2002 0.03215806 3306 0.0435126 2647 0.03540095 2533 0.03535389 7184 0.03592 3372 0.03790169 5386 0.03286692 4708 0.02354

583.3(Tl-208[86%]) 2472 0.03668744 3720 0.0372 2040 0.03276845 2994 0.03940614 2570 0.03437115 3473 0.04847377 9378 0.04689 4354 0.04893949 5592 0.03412399 0609.5(Bi-214[46%]) 2080 0.03086969 3094 0.03094 1981 0.03182074 2724 0.03585248 1992 0.02664099 2889 0.04032269 8230 0.04115 3769 0.04236402 5341 0.03259231 581 0.002905661.6(Cs-137[85%]) 28859 0.42830217 4659 0.04659 0 0 0 0 2077 0.010385 2116 0.0237841 1217 0.00742648 0727.5(Bi-212[12%]) 377 0.00559513 890 0.0089 353 0.00567023 707 0.00930533 462 0.00617878 725 0.01011906 2310 0.01155 993 0.01116144 1381 0.00842726 0767.8(Bi-214[4.9%]) 0 0 0 0 0 0 652 0.00326 319 0.0035856 361 0.00220293 0771.9(Ac-228[1.6%]) 0 0 0 0 0 0 361 0.001805 0 246 0.00150116 0785.3(Bi-212[2%]) 0 0 0 0 0 0 559 0.002795 0 432 0.00263619 0794.8(Ac-228[4.8%]) 339 0.00503117 485 0.00485 291 0.00467432 400 0.00526468 230 0.00307602 358 0.00499672 1130 0.00565 530 0.00595727 724 0.00441806 0835(Ac-228[1.8%]) 0 0 0 0 0 0 467 0.002335 242 0.00272011 427 0.00260568 0

860.3(Tl-208[12%]) 268 0.00397744 488 0.00488 262 0.0042085 381 0.00501461 318 0.00425293 406 0.00566667 1029 0.005145 528 0.00593478 787 0.0048025 0911(Ac-228[29%]) 1693 0.02512615 2432 0.02432 1282 0.02059272 1939 0.02552055 1834 0.0245279 2370 0.03307884 6741 0.033705 3166 0.03558623 4156 0.0253611 359 0.001795

964.5(Ac-228[5.5%]) 299 0.00443752 387 0.00387 224 0.0035981 356 0.00468557 309 0.00413256 415 0.00579229 1169 0.005845 529 0.00594602 600 0.00366137 0968.8(Ac-228[17%]) 995 0.01476699 1426 0.01426 822 0.01320376 1160 0.01526758 971 0.01298614 1421 0.01983335 3734 0.01867 1677 0.01884969 2369 0.01445632 252 0.001261120.2(Bi-214[15%]) 507 0.00752449 845 0.00845 491 0.00788692 555 0.00730475 427 0.00571069 0 2103 0.010515 838 0.00941922 1317 0.00803671 286 0.001431238(Bi-214[5.9%]) 0 0 0 0 0 706 0.00985387 743 0.003715 388 0.00436117 470 0.00286807 01377(Bi-214[4%]) 0 0 0 0 0 0 570 0.00285 305 0.00342824 282 0.00172084 0

1460.8(K-40[11%]) 6201 0.09203028 8960 0.0896 5823 0.09353466 7112 0.09360604 7921 0.10593538 7323 0.10220944 24091 0.120455 11580 0.13016062 12976 0.07918327 4834 0.024171587.5(Ac-228[3.7%]) 0 0 0 0 0 0 614 0.00307 327 0.00367552 377 0.00230056 01592.2(Tl-208, 2614.5keV double escape) 0 0 0 0 0 0 503 0.002515 283 0.00318095 394 0.0024043 226 0.001131620(Bi-212[2.8%]) 0 0 0 0 0 0 320 0.0016 0 280 0.00170864 0

1629.1(Ac-228[1.9%]) 0 0 0 0 0 0 341 0.001705 0 230 0.00140353 01727.9(Bi-214[3%]) 0 0 0 0 0 0 379 0.001895 0 239 0.00145845 01763.8(Bi-214[16%]) 484 0.00718314 823 0.00823 412 0.00661794 526 0.00692306 476 0.00636602 526 0.00734155 2001 0.010005 890 0.01000371 1295 0.00790246 585 0.0029252101.5(Tl-208, 2614.5keV single escape) 0 0 0 0 0 0 778 0.00389 381 0.00428249 566 0.00345389 327 0.0016352203.1(Bi-214[5%]) 0 0 0 0 0 0 517 0.002585 276 0.00310227 383 0.00233718 262 0.00131

RESULT-COMPARISON OF COUNTING RATES

CONCLUSION The components of radionuclides of soil in a campus do not vary significantly.

A small numbers of 137Cs is expectable to be detected.

STUDY PLAN Before Entrance

Academic WritingProgram Designing (C++)Discussion

In Graduate School Learn from Speeches and Conferences Experiment while Simulation Language Skills

THANKS FOR YOUR ATTENTION