Calibration Method Based on Direct Radioactivity Measurement for Radioactive Gas Monitoring Instruments

A calibration method for radioactive gas monitoring instruments was studied. In the method, gaseous radioactivity standards were provided on the basis of the direct radioactivity measurement by the diffusion-in long proportional counter method (DLPC method) . The radioactivity concentration of the g...

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Bibliographic Details
Published in:RADIOISOTOPES 1993/08/15, Vol.42(8), pp.452-460
Main Authors: YOSHIDA, Makoto, WU, Youyang, OHI, Yoshihiro, CHIDA, Tohru
Format: Article
Language:eng ; jpn
Subjects:
calibration
conversion factor
gas-flow ionization chamber
monitoring instrument
proportional counter
radioactive gas
radioactivity
standard radioactivity measurement
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Summary:A calibration method for radioactive gas monitoring instruments was studied. In the method, gaseous radioactivity standards were provided on the basis of the direct radioactivity measurement by the diffusion-in long proportional counter method (DLPC method) . The radioactivity concentration of the gas mixture through a monitoring instrument was determined by sampling the known volume of the gas mixture into the proportional counter used for the DLPC method. Since oxygen in the gas mixture decreased the counting efficiency in a proportional counter, the influence on calibration was experimentally estimated. It was not serious and able to be easily corrected. By the present method, the relation between radioactivity concentration and ionization current was determined for a gas-flow ionization chamber with 1.5l effective volume. It showed good agreement with the results in other works.
ISSN:0033-8303
1884-4111
DOI:10.3769/radioisotopes.42.452