Radiant energy – Geological testing or irradiation – With sampling
Patent
1990-08-15
1992-07-07
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
With sampling
73 2805, G01T 704
Patent
active
051285398
ABSTRACT:
Apparatus having reduced background for measuring radiation activity in aerosol particles. A continuous air monitoring sampler is described for use in detecting the presence of alpha-emitting aerosol particles. An inlet fractionating screen has been demonstrated to remove about 95% of freshly formed radon progeny from the aerosol sample, and approximately 33% of partially aged progeny. Addition of an electrical condenser and a modified dichotomous virtual impactor are expected to produce considerable improvement in these numbers, the goal being to enrich the transuranic (TRU) fraction of the aerosols. This offers the possibility of improving the signal-to-noise ratio for the detected alpha-particle energy spectrum in the region of interest for detecting TRU materials associated with aerosols, thereby enhancing the performance of background-compensation algorithms for improving the quality of alarm signals intended to warn personnel of potentially harmful quantities of TRU materials in the ambient air.
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Marlow William H.
McFarland Andrew R.
Oritz Carlos A.
Rodgers John C.
Eisenberg Jacob M.
Freund Samuel M.
Gaetjens Paul D.
Hannaher Constantine
Moser William R.
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