Comparative response of selected thermoluminescence materials in a mixed-gamma and -neutron radiation environment

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:68092

Bennion, J S; Sandquist, G M; Hardy, B L ^[1]; Rogers, V C ^[2]; Terry, B W ^[3]

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1. Univ. of Utah, Salt Lake City, UT (United States)
2. Rogers & Associates Eng. Corp., Salt Lake City, UT (United States)
3. Teledyne Isotopes, Westwood, NJ (United States)

Six materials ({sup nat}LiF:Mg,Ti; {sup 6}LiF:Mg,Ti; {sup 7}LiF:Mg,Ti; CaF{sub 2}:Mn; CaSO{sub 4}:Mn; and CaSO{sub 4}:Dy) were evaluated for thermoluminescence (TL) response in a mixed gamma and neutron radiation environment by irradiating the materials to various levels of 1-MeV equivalent neutron fluence. In order to assess the suitability of the materials as reliable indicators of gamma absorbed dose in the mixed radiation field, response characteristics were compared with the response of identical TL dosimeters calibrated by irradiation in a NIST-traceable {sup 137}Cs gamma field. Fading, glow curve shape, and integrated response from the TL materials irradiated in the mixed and pure gamma radiation environments are compared and discussed. CaF{sub 2}:Mn was found to be a superior material for gamma dosimetry in the mixed-field environment due to neutron insensitivity, excellent linearity in the dosimeter response with 1-MeV fluence, low fading characteristics, and independence of the TL response with isotopic purity of the phosphor.

• OSTI ID: 68092
• Report Number(s): CONF-940507--Vol.1
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCIUM SULFATES
DYSPROSIUM
FAST NEUTRONS
IRRADIATION
LITHIUM FLUORIDES
MAGNESIUM
MANGANESE
NEUTRON FLUENCE
PHOTONS
RADIATION EFFECTS
THERMOLUMINESCENCE
TITANIUM