Handmade Air Geiger Counter

Window film

In fact, a kitchen wrap is the optimal film. Polyethylene film is not suitable.
The kitchen wrap is made of polyvinylidene chloride (PVDC), and is very thin as 11um. Therefor, it is easy to pass along radiation.
Oxygen permeability is very low, and it is convenient to hardly pass gas.
The molecule of butane(CH3-CH2-CH2-CH3) gas is larger than oxygen(O2).

Oxygen permeability[cc/m2-dayEatm]
Polyvinylidene chloride50
Polyethylene9000
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