Accession Number : AD0682198

Title :   THE QUALITY AND LET DEPENDENCE OF THREE THERMOLUMINESCENT DOSIMETERS AND THEIR POTENTIAL USE AS SECONDARY STANDARDS.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Tochilin,Eugene ; Goldstein,Norman ; Lyman,J. T. ; Miller,William G.

Report Date : 07 NOV 1968

Pagination or Media Count : 23

Abstract : The energy dependence of thermoluminescent dosimeters was investigated over a range of x- and gamma-ray energies extending from 6 to 2750 keV. Radiation sources included filtered x rays and isotopes emitting gamma rays of known energies. In order to correlate the energy deposited in the phosphor with light output, the measured response was compared with the computed value of absorbed dose. A systematic increase in light output with decreasing photon energy was observed for all phosphors: this was interpreted as an LET effect. The LET dependence of these phosphors was then investigated with accelerator-produced charged particles for LET values from 0.25 keV/micron to beyond 1000 keV/micron. Response curves are presented which allows the use of LiF and Li2B4O7:Mn as secondary standards to measure absorbed dose or exposure. The use of this method for x- and gamma-ray measurements down to 6 keV is described. Calibration is by means of a 60Co gamma-ray standard. (Author)

Descriptors :   (*PHOSPHORESCENT MATERIALS, THERMOLUMINESCENCE), (*THERMOLUMINESCENCE, DOSIMETERS), (*DOSIMETERS, RESPONSE), RADIATION DOSAGE, PROTONS, ION BEAMS, X RAYS, GAMMA RAYS, PHOTONS, ENERGY, STANDARDS, QUALITY CONTROL, CALIBRATION

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE