Passive integrating radon monitor

Alter, H. W., and R. L. Fleischer, Passive Integrating Radon Monitor in Environmental Monitoring, Health Phvs. 40 693 (1981). 

The instruments include an ionization chamber, the charcoal-trap technique, a flow-type ionization chamber (pulse-counting technique), a two-filter method, an electrostatic collection method and a passive integrating radon monitor. All instruments except for the passive radon monitor have been calibrated independently. Measurements were performed... 

Passive Integrating Radon Monitor PRM electrostatic sampling -180 V applied, dehumidified, CN-film, exposed time two months a measurement... 

Iida, T., Passive Integrating Radon Monitor, Hoken-butsuri, 20 407-415 (1985). 

Measurements of radon progeny, which are the more difficult to make, can be replaced with measurements of radon to provide information on the upper limit for the potential alpha energy exposure from radon progeny. Therefore, simple passive radon monitors for integrated measurements of 1 to 12 months (Alter and Fleischer,... 

Another important finding is that simple passive radon monitoring devices, used for short integrating periods, can be very useful in acquiring the data necessary to undertake a national survey for indoor radon. 

Annanmaki, M., H. Koskela, M. Koponen, and 0. Parviainen, RADOK An Integrating, Passive Radon Monitor, Health Physics, 44 413-416 (1983). 

Activated charcoals Passive radon measurements can be achieved without a passive detector by absorbing radon with activated charcoal, which is analyzed by y-ray spectrometry at the end of the exposure. These charcoal-based radon monitors are sufficiently sensitive for the assessment of short-term integrated (less than 1 week) radon exposures. They have been widely applied for screening surveys. Unfortunately, because of the 3.825 day half-life of Rn, the exposure period cannot be longer than 1 week and the detector must be analyzed in the laboratory soon after the exposure. For the same reason, this technique does not provide a true integration, but a response more closely related to the last day or two of exposure. 

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