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august 2016

RADON 2016 - PRAGUE - 12 TO 16 SEPTEMBER RADON CONFERENCE

MI.AM will be as a sponsor in Prague at the 8th International Conference on protection against radon at home and at work al at 13th International Workshop GARRM (on the Geological Aspect of Radon Risk Mapping) The conference will be held at the Faculty of Nuclear Sciences and Physical Engineering (www.fjfi.cvut.cz) of the Czech Technical university (www.cvut.cz)
The address is FNSPE CTU, Brehová 7, 110 00, Prague 1.

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E-PERM THORON CHAMBER


Thoron is an isotope of radon, which originates from thorium and has a very short half life of about 1 minute. Measuring Thoron is important in some areas rich in thorium or in areas where thorium is handled. Thoron can also be an interference in measuring radon.




HOW IT WORKS
The standard E-PERMs are designed to minimize the response to 220Rn (thoron) by restricting the diffusion entry time. This is achieved by having a very small area filter for the passive diffusion. Because of short half life (about one minute); it decays before entering the active area of the E-PERM. The chamber of such unit was modified deliberately by increasing the filtered diffusion area from 0.3 cm2 to 30 cm2 to allow thoron to diffuse into the chamber with very little delay time. This modified unit is called the Radon-Thoron E-PERM or RT E-PERM because it responds to both radon and thoron. It is necessary to expose a set consisting of one radon and one radon-thorn E-PERM simultaneously in the test atmosphere. Results are used to calculate both radon and thoron concentrations in air.











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