Experimental comparison of the responses of CAF{sub 2} and LIF TLD chips

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Health Physics

OSTI ID:393950

Mckeever, R; Hsu, H H; Casson, W H; Hoffman, J M; Vasilik, D G ^[1]

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1. Los Alamos National Laboratory, NM (United States)

The responses of LiF and CaF{sub 2} TLD chips, calculated with the Monte Carlo code MCNP, show the following ratios: (1) for TLD chips free in the air exposed to a bare {sup 252}Cf neutron source; {sup 6}LiF / {sup 7}LiF / CaF{sub 2} = 1.0 / 0.43 / 0.21. (2) to a D{sub 2}O moderated {sup 252}Cf neutron source; {sup 6}LiF / {sup 7}LiF / CaF{sub 2} = 1.00 / 0.022 / 0.010. (3) for TLD chips placed inside a plastic holder and with a water phantom, exposed to a bare {sup 252}Cf source; {sup 6}LiF / {sup 7}LiF / CaF{sub 2} = 1.00 / 0.27 / 0.13 (4) to a D{sub 2}O moderated neutron source; {sup 6}LiF / {sup 7}LiF / CaF{sub 2} = 1.00 / 0.020 / 0.0070. (5) chips free in the air and to a {sup 137}CS photon source at energy of 661 keV, LiF / CaF{sub 2} = 1.00 / 1.05. (6) chips inside a plastic holder and with a water phantom, LiF / CaF{sub 2} = 1.00 / 1.10. Monte Carlo calculations for the responses tallied by energy deposition per unit mass (i.e., absorbed dose) did not include the difference in fluorescence mechanism between two kinds of chips and the optical attenuations of the chip. The measured responses in terms of the photo-mulitiplier tube current may yield different ratios. We performed experimental measurements under the same given conditions used in the calculations. The results show reasonable agreements between calculations and measurements.

• OSTI ID: 393950
• Report Number(s): CONF-9607135--
• Journal Information: Health Physics, Journal Name: Health Physics Journal Issue: Suppl.6 Vol. 70; ISSN HLTPAO; ISSN 0017-9078
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
99 GENERAL AND MISCELLANEOUS
CALCIUM FLUORIDES
CALIFORNIUM 252
ELECTRONS
FLUORESCENCE
LITHIUM FLUORIDES
MONTE CARLO METHOD
NEUTRON SOURCES
NEUTRONS
PERFORMANCE
PHANTOMS
PHOTONS
RESPONSE FUNCTIONS
SENSITIVITY
THERMOLUMINESCENT DOSEMETERS