GERDA Collaboration Meeting GERDA Collaboration Meeting LNGS, 28 LNGS, 28 – – 30 September 2009 30 September 2009 Behavior of Behavior of 222 222 Rn Rn and its daughters and its daughters in N in N 2 2 and LN and LN 2 2 Nikodem Frodyma, Marcin W Nikodem Frodyma, Marcin W ó ó jcik, Krzysztof Pelczar jcik, Krzysztof Pelczar
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Behaviour of 222Rn and its daughters in LN2 and LAr · GERDA Collaboration Meeting LNGS, 28–30 September 2009 Behavior of 222Rn Rn and its daughters and its daughters in N in N
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GERDA Collaboration MeetingGERDA Collaboration MeetingLNGS, 28LNGS, 28––30 September 200930 September 2009
Behavior of Behavior of 222222RnRn
and its daughtersand its daughters in Nin N 22 and LNand LN 22
Nikodem Frodyma, Marcin WNikodem Frodyma, Marcin Wóójcik, Krzysztof Pelczarjcik, Krzysztof Pelczar
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OutlineOutline
•
Radon daughters in LN2–
Long term behaviour
–
influence of impurities
–
Simple model of the phenomenon–
Test of the model
•
Radon in gaseous N2–
Rn
freezing out on the walls above the LN2
surface–
Rn
daughters ”diffusion”
into the liquid
•
Summary
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RnRn daughters in LNdaughters in LN22 –– long term long term behaviourbehaviour•
Each created Rn
daughter is positively
charged right after the
decay•
Electric field attracts the ions
++
+
+
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RnRn daughters in LNdaughters in LN22 –– long term long term behaviourbehaviour
•
Positive ion remains charged due to differences in ionizing potentials of the surrounding atoms and the ion