Third Personnel Dosimetry Intercomparison Study

Technical Report · Mon Jan 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/6472903· OSTI ID:6472903

Gilley, L. W.; Dickson, H. W.

The third Personnel Dosimetery Intercomparison Study was held at the Oak Ridge National Laboratory Dosimetry Applications Research Facility during March 15--16, 1977. The Health Physics Research Reactor (HPRR), used unshielded, with a 12-cm-thick Lucite shield or a 13-cm-thick steel shield, provided three neutron and gamma-ray spectra. The characteristics of these fields such as neutron energy spectra, intensity, and uniformity had been measured previously during nuclear accident dosimetry studies. Exposures were made to simulate total exposures likely to be encountered in personnel dosimetry. Neutron dose equivalents of the order of 500 millirem were produced by controlling the reactor power level and exposure time. Dosimeters were mounted on the trunk section of water-filled phantoms, the front edges of which were located 3 m from the reactor center. When shields were used they were placed at 2 m from the core. Sulfur pellets exposed at a standard location on the reactor during the intercomparison were used to calculate values of tissue kerma for neutrons at the 3-m position based on previous measurements. Using the fission yield and the calculated leakage of the HPRR, the neutron fluence was calculated for each reactor run. Then the dose was calculated based on the HPRR neutron spectra and the dose conversion factors, which had been calculated previously for the three spectra. The results of these personnel dosimetry intercomparison studies reveal that estimates of dose equivalent vary over a wide range. The standard deviation of the mean of participants data was in the range of 25 to 50%.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6472903
• Report Number(s): ORNL/TM-6114
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600 -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
61 RADIATION PROTECTION AND DOSIMETRY
655003 -- Medical Physics-- Dosimetry
AIR COOLED REACTORS
ALBEDO-NEUTRON DOSEMETERS
ALLOYS
COMPARATIVE EVALUATIONS
DOSEMETERS
DOSIMETRY
ENRICHED URANIUM REACTORS
EPITHERMAL REACTORS
ESTERS
FAST REACTORS
GAMMA DOSIMETRY
GAS COOLED REACTORS
HPRR REACTOR
IRON ALLOYS
IRON BASE ALLOYS
LUCITE
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MOCKUP
NEUTRON DOSIMETRY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PERFORMANCE TESTING
PERSONNEL DOSIMETRY
PETROCHEMICALS
PETROLEUM PRODUCTS
PHANTOMS
PHOTOGRAPHIC FILM DOSEMETERS
PLASTICS
POLYACRYLATES
POLYMERS
POLYVINYLS
PULSED REACTORS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SHIELDING
STEELS
STRUCTURAL MODELS
TESTING
THERMOLUMINESCENT DOSEMETERS