Aluminium shielding for Geiger counter

Carrying out Geiger counter mode radiation measurement with iMetry,
・Shielded with Aluminium 20mm
・Shielded with Paper 20mm
Tested if they have difference with a 137Cs radiation source.
In both cases, 5mm aluminium plate is inserted to block beta rays from the radiation source.

Al 5mm plate + Al 20mm Al 5mm plate + Paper 20mm
Cs137-20mmAl.jpeg
0.2078μSv/h
1104.5cpm
Cs137-20mmBook.jpeg
0.2007μSv/h
1066.6cpm
Cs137-20mmAlDose.PNG Cs137-20mmBookDose.PNG

As a conclusion, radiation doses are almost same in both cases. This indicates that gamma rays from 137Cs can not be blocked with 20mm Aluminium.
Well, in case with 20mm Aluminium, higher dose (counts) was observed, maybe braking X-ray derived from gamma rays hitting the Aluminium was observed.

  • 最終更新:2013-06-19 09:29:38

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