Evaluation of Characteristics of Passive Radon Monitor Focussed on its Transient Characteristics.

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Dynamic characteristics of a passive radon monitor which is designed based on the diffusive deposition, was investigated by the use of a silicon semiconductor detector (silicon photo diode) settled in the monitor's interior. For the purpose, time variations of alpha particles emitted from gaseous radon in the monitor and deposited radon daughters on the internal surface were measured under the following conditions: (1) there is no aerosol in the monitor, (2) there is abundant aerosol in the monitor, (3) there is no aerosol but there is electrostatic field due to electric charges, i.e., the internal surface is positively charged and the detector (solid state track detector) is negatively charged. From these experimental results, it was clarified that the influence of aerosol on the behavior of radon daughters depends on the dimension of a monitor, while there is little influence of the electrostatic field in the monitor. Furthermore, the ventilation rate of the monitor, which is an important factor for passive monitors, was also determined directly from the time variation of alpha particles emitted from radon.
一般社団法人日本原子力学会の論文