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Development of a Prototype Instant Working Level Meter With Automatic Individual Radon-daughter Readout.
Groer-PG; Keefe-DJ; McDowell-WP; Selman-RF
NTIS: PB/249-545 Available for Reference At Bureau Libraries :74 pages
The instant working level meter (iwlm) evaluates the working level and the individual rn-daughter concentrations in a uranium mine atmosphere within 5 minutes. The instrument is portable and fully automatic. The wl and the raa, rab, and rac concentrations (pci/liter) are displayed in digital form. Calculation of these quantities is performed by a preprogramed cmos calculator chip using the counts observed in the instruments three channels (raa, rab+c, rac). The rn-daughters are collected on a membrane filter at a flowrate of 12 liter/min. Spectroscopy is performed with a silicon surface barrier detector, the b+y counts are detected with a plastic scintillator plus pm tube. No assumptions about rn-daughter equilibrium are made. Only constancy of the rn-daughter concentrations during the time of sampling (2 minutes) is assumed. The unit is entirely solid state with the exception of the photomultiplier. The range of the instrumentis 0.01-100 Wl.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/249-545 Available for Reference At Bureau Libraries
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division