NEW DEVICES FOR INDIVIDUAL NEUTRON DOSIMETRY

This paper deals with the design and fabrication of three new dosimetr ic sensors to be used in personal radiation monitoring. The first two sensors, double diode and streamer chamber, are based on the same part icle detection principle, the last is a multicellular tissue-equivalen t proportional counter. Each dosimetric sensor has a preferential rang e of applications. The double diode dosemeter, called DIAC(1,2), is th e least sensitive, but can be reduced to the size of an 'electronic cr edit card' weighing a few 10s of grams. Two versions of the streamer c hamber have been developed, the first corresponding to a personal devi ce called DINE and the second to an ambient device called DANE(1). The se two sensors are much more sensitive than the DIAC. The last sensor, studied in the SDOS laboratory, is a multicellular proportional count er called MC-TEPC(1,3). Giving both the dose and the dose equivalent q uantities, it is more suitable for a good evaluation quantities, it is more suitable for a good evaluation of the radiation risk but many pr oblems due to gas aging have to be solved.