Passive multi-element beta dosimeter

Conference · Wed Jun 01 04:00:00 EDT 1983

OSTI ID:6057399

Scherpelz, R I; Rathbun, L A; Endres, G W.R.; Murphy, D W

A new concept has been used to develop a passive dosimeter for determining the dose resulting from a field of beta radiation. This concept uses TLD chips placed under several aluminum shields of varying thicknesses. Each shield attenuates the beta radiation to some degree, depending on the thickness of the shield. An indication of the beta energy spectrum can be obtained by examining the relative responses of the TLDs under the different shields and comparing these relative responses to the similar dosimeters that have been exposed to calibrated sources. This indication of the spectrum allows the selection of a calibration factor for converting TLD response to dose. Since TLD response to betas is energy dependent, it is important to be able to select the proper energy-dependent calibration factor. The Pacific Northwest Laboratory (PNL) multi-element beta dosimeters employ aluminum shields ranging in thickness from 6.9 to 860 mg/cm/sup 2/. The thickest filter blocks out essentially all betas and is used to evaluate the gamma dose. This gamma component is subtracted from the other responses before analyzing for the beta dose. Another element of the dosimeter is shielded by a very thin layer of aluminized mylar to cause essentially no attenuation of the betas. Multi-element dosimeters have been employed in configurations of 4-, 7-, and 8-elements.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6057399
• Report Number(s): PNL-SA-11048; CONF-830695-5; ON: DE83016183
• Country of Publication: United States
• Language: English

Related Subjects

440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BETA DOSIMETRY
CALIBRATION
DESIGN
DOSEMETERS
DOSIMETRY
ENERGY DEPENDENCE
ENERGY SPECTRA
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
SPECTRA
THERMOLUMINESCENT DOSEMETERS
THERMOLUMINESCENT DOSIMETRY