A new personal dosemeter for the individual monitoring of exposure to radon gas

摘要

Rn-Disk dosemeter, a new close-type radon device, is here proposed. Rn-Disk passive monitorconsists in a diffusion chamber, made by conductive plastic material (polypropylene enriched with carbon), thatholds CR-39 plastics solid-state track detectors (SSNTD). The Rn-Disk passive device (patent pending) has beendesigned and developed to assess radon exposure received by workers and members of the public.This passive device is an ON/OFF chamber, made of an upper and lower half which snap together duringassembly. In particular, it has been designed to exclude radon progeny and dusts entry whilst it allows access ofradon gas. The operation principle is based on the revolving cap capability to rotate between 0° and 180° towardits base.This paper includes◇ a general description of Rn-Disk passive device;◇ preliminary results of several type-tests and qualification tests, conducted in order to define theperformances of the Rn-Disk dosemeter, when a CR-39 detector is enclosed in.Emphasis has been given to the investigation of Rn-Disk dosemeter performances in term of sensitivity, level ofprecision and accuracy of radon measurements, reproducibility, influence of environmental parameters (astemperature, humidity, dusts, etc.), etc. in accordance with ISO standards requirements.