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  • The use of enriched 6Li and 7Li Lif:Mg,Cu,P glass-rod thermoluminescent dosemeters for linear accelerator out-of-field radiation dose measurements.

The use of enriched 6Li and 7Li Lif:Mg,Cu,P glass-rod thermoluminescent dosemeters for linear accelerator out-of-field radiation dose measurements.

Radiation protection dosimetry (2011-08-30)
R Takam, E Bezak, G Liu, L Marcu
ABSTRACT

(6)LiF:Mg,Cu,P and (7)LiF:Mg,Cu,P glass-rod thermoluminescent dosemeters (TLDs) were used for measurements of out-of-field photon and neutron doses produced by Varian iX linear accelerator. Both TLDs were calibrated using 18-MV X-ray beam to investigate their dose-response sensitivity and linearity. CR-39 etch-track detectors (Luxel+, Landauer) were employed to provide neutron dose data to calibrate (6)LiF:Mg,Cu,P TLDs at various distances from the isocentre. With cadmium filters employed, slow neutrons (<0.5 eV) were distinguished from fast neutrons. The average in-air photon dose equivalents per monitor unit (MU) ranged from 1.5±0.4 to 215.5±94.6 μSv at 100 and 15 cm from the isocentre, respectively. Based on the cross-calibration factors obtained with CR-39 etch-track detectors, the average in-air fast neutron dose equivalents per MU range from 10.6±3.8 to 59.1±49.9 μSv at 100 and 15 cm from the isocentre, respectively. Contribution of thermal neutrons to total neutron dose equivalent was small: 3.1±7.2 μSv per MU at 15 cm from the isocentre.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lithium fluoride, powder, -300 mesh
Sigma-Aldrich
Lithium fluoride, BioUltra, ≥99.0% (F)
Sigma-Aldrich
Lithium fluoride, powder, <100 μm, ≥99.98% trace metals basis
Sigma-Aldrich
Lithium fluoride, Precipitated, 99.995%
Sigma-Aldrich
Lithium fluoride, ≥99.99% trace metals basis
Sigma-Aldrich
Lithium-6Li fluoride, 95 atom % 6Li, 99% (CP)