Electret

E-perm® passive integrating electret ionization chambers for measuring radon in air, thoron in air, radon in water and radon flux from surfaces/building materials

Submitted by on Sat, 07/06/2013 - 16:43

Electret ion chamber (EIC) for monitoring radon consists of a stable electret (electrically chargedTeflon disc) mounted inside an electrically conducting chamber. PERM? passive integrating electretionization chambers for measuring radon in air has a restricted filtered passive access to radon (222Rn), allowing it to respond only to radon and not to thoron(220Rn) A modified unit called thoron monitor, with unrestricted access to thoron responds to both radon and thoron. Radon monitor and thoron monitor when used side by side allows measurement of both radon and thoron concentrations in air.