Radiant energy – Invisible radiation responsive nonelectric signalling
Patent
1991-03-06
1991-11-26
Fields, Carolyn E.
Radiant energy
Invisible radiation responsive nonelectric signalling
250253, 250255, 2504841, G01T 102, G01T 111
Patent
active
050685384
ABSTRACT:
A compact electrically conductive housing includes a plurality of access ports defined in the top section of the housing to permit radon gas (.sup.222 Rn) to diffuse into the housing. The access ports are covered by a diffusion barrier such as a layer of foam rubber sheet inside the housing. The bottom section of the housing includes an integrally molded, electrically conductive pedestal having three recessed wells therein. Two wells contain a stacked pair of an SSNTD on top of a calcium fluoride TLD. The third well contains the same components, but with the TLD on top of the SSNTD, and TLD of this stacked pair is pre-dosed with gamma-rays. The pedestal is covered with a film of electrically neutral aluminized MYLAR (polyester film). A background protection disc prevents substantial exposure of the SSNTDs to radon radition until the desired measurment period beings, once the monitor reaches the intended measurement site. The disc further prevents additional exposure once the intended measurment period is concluded.
REFERENCES:
patent: 4417142 (1983-11-01), Malmqvist et al.
patent: 4920272 (1990-04-01), Yoder
patent: 4948970 (1990-08-01), Port et al.
Fields Carolyn E.
New York University
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