A new passive radon-thoron discriminative measurement system.
A new passive radon-thoron discriminative measurement system has been developed for monitoring radon and thoron individually. It consists of a 'couple' of passive integrating devices with a CR39 nuclear track detector (NTD). The experimental prototype is based on the application of a new concept of NTD instrument developed at ENEA, named Alpha-PREM, acronym of piston radon exposure meter, which allows controlling the detector exposure with a patented sampling technique (Int. Eu. Pat. and US Pat.). The 'twin diffusion chambers system' was based on two A-PREM devices consisting of the standard device, named NTD-Rn, and a modified version, named NTD-Rn/Tn, which was set up to improve thoron sampling efficiency of the diffusion chamber, without changing the geometry and the start/stop function of the NTD-Rn device. Coupling devices fitted on each device allowed getting a system, which works as a double-chamber structure when deployed at the monitoring position. In this paper both technical and physical aspects are considered.
Sciocchetti
G
G
Technoradon S.r.l., Via Pereira 205, Rome, Italy. g.sciocchetti@technoradon.it
Sciocchetti
A
A
Giovannoli
P
P
DeFelice
P
P
Cardellini
F
F
Cotellessa
G
G
Pagliari
M
M
D000396:Air Pollutants, Radioactive; D016902:Air Pollution, Indoor / Q000032:analysis*; D004781:Environmental Exposure; D004867:Equipment Design; D005740:Gases; D006798:Housing; D006801:Humans; D011834:Radiation Monitoring / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*; D012306:Risk
D000396:Air Pollutants, Radioactive; D005740:Gases; D017687:Radon Daughters; D011886:Radon