Method of continuously determining radiation working level exposure
This patent describes a method for determining the working level exposure to airborne radioactive material by measuring the beta count per unit time. The gas radon-222 gives off three short lived daughter products commonly designated as RaA, RaB and RaC. Air, within the environment whose level is to be measured, is pumped through an opened face filter and screen assembly forming part of a detector holder mount. Radioactive particulate matter consisting of radon-222 daughter products is collected on the filter. Thereafter, beta particles generated by the radioactive decay of the daughter products impinge upon a Geiger-Mueller tube which detects the beta particle activity per unit time. A pulse integrating system counts the detected beta particles. Based on prior experimentally calibrated results, the total count of beta particles is converted to a working level exposure.
- Assignee:
- EDB-80-118587
- Patent Number(s):
- US 4185199
- OSTI ID:
- 5128732
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALPHA DECAY RADIOISOTOPES
BETA DOSIMETRY
BETA PARTICLES
BISMUTH ISOTOPES
CHARGED PARTICLES
DAYS LIVING RADIOISOTOPES
DOSES
DOSIMETRY
ELECTRONIC EQUIPMENT
EQUIPMENT
EVEN-EVEN NUCLEI
GEIGER-MUELLER COUNTERS
HEAVY NUCLEI
ISOTOPES
LEAD ISOTOPES
MEASURING INSTRUMENTS
NUCLEI
POLONIUM ISOTOPES
PULSE INTEGRATORS
RADIATION DETECTORS
RADIATION DOSES
RADIOISOTOPES
RADON 222
RADON ISOTOPES