Tenth ORNL Personnel Dosimetry Intercomparison Study

Technical Report · Fri Mar 01 04:00:00 EST 1985

DOI:https://doi.org/10.2172/5984968· OSTI ID:5984968

Swaja, R E; Chou, T L; Sims, C S; Greene, R T

The Tenth Personnel Dosimetry Intercomparison Study was conducted at the Oak Ridge National Laboratory during April 9-11, 1984. Dosemeter badges from 31 participating organizations were mounted on 40cm Lucite phantoms and exposed to a range of dose equivalents which could be encountered during routine personnel monitoring in mixed radiation fields. The Health Physics Research Reactor served as the only source of radiation for eight of the ten irradiations which included a low (approx. 0.50 mSv) and high (approx. 10.00 mSv) neutron dose equivalent run for each of four shield conditions. Two irradiations were also conducted for which concrete- and Lucite-shield reactor irradiations were gamma-enhanced using a /sup 137/Cs source. Results indicated that some participants had difficulty obtaining measurable indication of neutron and gamma exposures at dose equivalents less than about 0.50 mSv and 0.20 mSv, respectively. Albedo dosemeters provided the best overall accuracy and precision for the neutron measurements. Direct interaction TLD systems showed significant variation in accuracy with incident spectrum, and threshold neutron dosemeters (film and recoil track) underestimated reference values by more than 50%. Gamma dose equivalents estimated in the mixed fields were higher than reference values with TL gamma dosemeters generally yielding more accurate results than film. Under the conditions of this study in which participants had information concerning exposure conditions and radiation field characteristics prior to dosemeter evaluation, only slightly more than half of all reported results met regulatory standards for neutron and gamma accuracy. 19 refs., 2 figs., 29 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5984968
• Report Number(s): ORNL-6143; ON: DE85009818
• Country of Publication: United States
• Language: English

Related Subjects

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
DOSE-RESPONSE RELATIONSHIPS
DOSIMETRY
ENRICHED URANIUM REACTORS
EPITHERMAL REACTORS
FAST REACTORS
GAMMA DOSIMETRY
GAS COOLED REACTORS
HPRR REACTOR
INTERLABORATORY COMPARISONS
MOCKUP
NEUTRON DOSIMETRY
PERSONNEL DOSIMETRY
PHANTOMS
PULSED REACTORS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
STRUCTURAL MODELS