A portable battery-powered continuous airborne {sup 222}Rn sampler | Zendy

S.C. Scarpitta | Zendy; M. Kadnar | Zendy

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A portable battery-powered continuous airborne {sup 222}Rn sampler

Author(s) -

S.C. Scarpitta,

M. Kadnar

Publication year - 1998

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/656453

Subject(s) - sorbent , relative humidity , liquid scintillation counting , chemistry , radiochemistry , humidity , sampling (signal processing) , analytical chemistry (journal) , environmental science , scintillation counter , carbon dioxide , adsorption , chromatography , meteorology , physics , organic chemistry , detector , optics

The Polyport, designed at the Environmental Measurements Laboratory (EML) for deployment in atmospheric balloons or remote areas, was laboratory and field tested to determine its effectiveness in collecting {sup 222}Rn gas in dry and humid air. Twelve 6-cm long tubes containing 0.4 g of Carboxen{trademark}-564 a hydrophobic beaded carbon molecular sieve (BCMS) material efficiently adsorbs airborne {sup 222}Rn under dynamic sampling conditions of 1--2 hr duration. The exposed sorbent is later weighed for water uptake, transferred and counted in a low background liquid scintillation (LS) counter that can detect alpha and beta emitting {sup 222}Rn progeny with a maximum counting efficiency of 5 cpm per dpm. Each sorbent tube can be gamma counted if it contains sufficient adsorbed {sup 214}Pb and {sup 214}Bi activity. The variables tested were sampling flow rate, temperature, sampling time and relative humidity (RH)

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