Environmental wodking level monitor. Final report. [for measuring airborne Rn-daughter concentrations]

Technical Report · Fri Sep 29 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6512034· OSTI ID:6512034

Keefe, D.; McDowell, W. P.; Groer, P. G.

The Environmental Working Level Monitor (EWLM) is an instrument used to automatically monitor airborne Rn-daughter concentrations and the Working Level (WL). It is an ac powered, microprocessor--based instrument with an external inverter provided for dc operation if desired. The microprocessor's control processor unit (CPU) controls the actuation of the detector assembly and processes its output signals to yield the measurements in the proper units. The detectors are fully automated and require no manual operations once the instrument is programmed. They detect and separate the alpha emitters of RaA and RaC' as well as detecting the beta emitters of RaB and RaC. The resultant pulses from these detected radioisotopes are transmitted to the CPU. The programmed microprocessor performs the mathematical manipulations necessary to output accurate Rn-daughter concentrations and the WL. A special subroutine within the system program enables the EWLM to run a calibration procedure on command which yields calibration data. This data can then be processed in a separate program on most computers capable of BASIC programming. This calibration program results in the derivation of coefficients and beta efficiencies which provides the calibrated coefficients and beta efficiencies required by the main system program to assure proper calibration of the individual EWLM's.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6512034
• Report Number(s): ANL--78-XX-94
• Country of Publication: United States
• Language: English

Related Subjects

440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
500300* -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR
ALPHA DECAY RADIOISOTOPES
ALPHA DETECTION
AUTOMATION
BETA DECAY RADIOISOTOPES
BETA DETECTION
BETA-MINUS DECAY RADIOISOTOPES
BISMUTH 214
BISMUTH ISOTOPES
CALIBRATION
CHARGED PARTICLE DETECTION
COMPUTER CODES
DETECTION
EARTH ATMOSPHERE
ENVIRONMENT
EVEN-EVEN NUCLEI
FLUIDS
GASES
HEAVY NUCLEI
ISOTOPES
LEAD 214
LEAD ISOTOPES
MEASURING INSTRUMENTS
MICROPROCESSORS
MICROSEC LIVING RADIOISOTOPES
MINUTES LIVING RADIOISOTOPES
MONITORING
NUCLEI
ODD-ODD NUCLEI
OPERATION
POLONIUM 214
POLONIUM 218
POLONIUM ISOTOPES
PROGRAMMING
RADIATION DETECTION
RADIATION MONITORING
RADIATION MONITORS
RADIOACTIVITY
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES