Development of a prototype instant working level meter with automatic individual radon-daughter readout
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 preprogrammed CMOS calculator chip using the counts observed in the three channels (RaA, Ra(B + C), RaC). The Rn-daughters are collected on a membrane filter at a flowrate of 12 liter/min; ..cap alpha.. spectroscopy is performed with a silicon surface barrier detector, the ..beta.. counts are detected with a plastic scintillator plup 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 instrument is 0.01-100 WL.
- Research Organization:
- Argonne National Lab., Ill. (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7340628
- Report Number(s):
- PB-249545
- Country of Publication:
- United States
- Language:
- English
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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AIR FILTERS
AIR POLLUTION MONITORS
AIR SAMPLERS
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BISMUTH 214
BISMUTH ISOTOPES
DAUGHTER PRODUCTS
DESIGN
ELEMENTS
EQUIPMENT
EVEN-EVEN NUCLEI
FILTERS
HEAVY NUCLEI
ISOTOPES
LABORATORY EQUIPMENT
LEAD 214
LEAD ISOTOPES
MEASURING INSTRUMENTS
MICROSEC LIVING RADIOISOTOPES
MINES
MINUTES LIVING RADIOISOTOPES
MONITORING
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OPERATION
PERFORMANCE
PLASTIC SCINTILLATION DETECTORS
POLLUTION CONTROL EQUIPMENT
POLONIUM 214
POLONIUM 218
POLONIUM ISOTOPES
RADIATION DETECTORS
RADIATION MONITORING
RADIOISOTOPES
RADON
RARE GASES
SAMPLERS
SCINTILLATION COUNTERS
SECONDS LIVING RADIOISOTOPES
SEMICONDUCTOR DETECTORS
SI SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
SURFACE BARRIER DETECTORS
URANIUM MINES