Beta-dosimetry studies at LLNL

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5592912

Hankins, D E

This paper summarizes three beta-dosimetry studies made recently at the Lawrence Livermore National Laboratory. The first study was to determine the beta-gamma exposure rates at the Los Alamos Godiva IV Critical Assembly. The beta spectra from the assembly were evaluated using absorption curves and the beta-gamma dose-rate ratios were determined at various distances from the assembly. A comparison was made of the doses determined using two types of TLD personnel dosimeters and a film badge. The readings of an Eberline RO-7 instrument and the dose rates determined by TLDs were compared. Shielding provided by various metals, gloves, and clothing were measured. The second study was to determine the beta energy response of the Eberline RO-7 instrument based on measurements made with the PTB beta sources. This study required additional calibration points for the PTB sources which were made using extrapolation chamber measurements. The third study resulted in two techniques to determine the beta energy (E/sub max/) from the readings of this-window portable survey instruments. Both techniques are based on the readings obtained using aluminium filters. One technique is for field application, requires one filter, and provides a quick estimate of the beta energy in three energy groups: < 0.5 MeV, 0.5 MeV to 1.5 MeV and > 1.5 MeV. The second technique is more complex requiring measurements with two or three filters, but gives the beta energy and the approximate shape of the beta spectrum. 9 references, 6 figures.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5592912
• Report Number(s): UCRL-88041; CONF-830204-13; ON: DE84002792
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BETA DOSIMETRY
BETA SPECTRA
BIOLOGICAL SHIELDING
DOSE RATES
DOSEMETERS
DOSIMETRY
EXPERIMENTAL REACTORS
FILTERS
LAWRENCE LIVERMORE LABORATORY
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
NATIONAL ORGANIZATIONS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH PROGRAMS
SHIELDING
SPECTRA
THERMOLUMINESCENT DOSEMETERS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
ZERO POWER REACTORS