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
- Resource Relation:
- Patent File Date: Filed date 29 Jun 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BETA DOSIMETRY
GEIGER-MUELLER COUNTERS
PULSE INTEGRATORS
BETA PARTICLES
BISMUTH ISOTOPES
LEAD ISOTOPES
POLONIUM ISOTOPES
RADIATION DOSES
RADON 222
ALPHA DECAY RADIOISOTOPES
CHARGED PARTICLES
DAYS LIVING RADIOISOTOPES
DOSES
DOSIMETRY
ELECTRONIC EQUIPMENT
EQUIPMENT
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
RADON ISOTOPES
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments