Radiant energy – Fluent material containment – support or transfer means – With irradiating source or radiating fluent material
Patent
1991-04-03
1994-06-07
Hannaher, Constantine
Radiant energy
Fluent material containment, support or transfer means
With irradiating source or radiating fluent material
250255, 25037002, 250380, 250432R, G01T 704
Patent
active
053192087
ABSTRACT:
A radon gas detector comprises a housing having an air inlet port leading to an interior, a radiation detection (e.g. alpha particle measurement) chamber and an air exhaust port leading from the interior chamber to the exterior of the housing. The chamber is closed to the entry of ambient light by a pair of light-obstructing baffles that respectively couple the air inlet and air exhaust ports to the interior chamber. Coupled with the air inlet port is a first removable, electrically conductive mesh filter. Coupled with the air exhaust port is a second, fixed electrically conductive mesh filter. Since each mesh filter is electrically conductive, it readily traps radon daughter products before they can enter into the interior chamber. Also, because of its mesh configuration, each filter readily permits substantial air flow. To measure radon concentration in the air being circulated through detector, a radiation (e.g. alpha particle responsive) detector in the form of an open photodiode array is disposed within the interior chamber, so as to be exposed to incident alpha particle emissions from the radon gas as it is drawn through the chamber by the operation of the exhaust fan. Daughter product concentration can be derived by a first measurement with the intake filter in place and then a second measurement with the intake filter removed. The difference between the two measurements yields daughter product concentration in working level units.
REFERENCES:
patent: 2499830 (1950-03-01), Malloy
patent: 4362941 (1982-12-01), Castleman et al.
patent: 4451736 (1984-05-01), Cameron
patent: 4604634 (1986-08-01), Feigt et al.
patent: 4609823 (1986-09-01), Berger et al.
patent: 4853536 (1989-08-01), Dempsey et al.
patent: 4871914 (1989-10-01), Simon et al.
patent: 4894535 (1990-01-01), Madnick et al.
patent: 5026986 (1991-06-01), Hurst
patent: 5235190 (1993-08-01), Tucker
Honeywell "At Ease" Radon Monitor Brochure Dec. 1988.
"On Improving the Validity of Wire Screen `Unattached` Fraction Rn Daughter Measurements", by Mukund Ramamurthi and Philip K. Hope, Health Physics, vol. 56, No. 2 (Feb.), 1989, pp. 189-194.
"Measurement of the Uncombined Fraction of Radon Daughters with Wire Screen", by Andreas C. George; Health and Safety Laboratory, U.S. Atomic Energy Commission, New York, N.Y. (identified as a manuscript received Jan. 28, 1972).
Dunn Drew A.
Hannaher Constantine
Wands Charles
LandOfFree
Forced air flow radon detector having electrically conductive in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Forced air flow radon detector having electrically conductive in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Forced air flow radon detector having electrically conductive in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-794605