title: The use of enriched 6Li and 7Li Lif:Mg,Cu,P glass-rod thermoluminescent dosemeters for linear accelerator out-of-field radiation dose measurements.
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.
authors.affiliation: School of Chemistry and Physics,  Adelaide University, Adelaide,  Australia.
authors.forename: R
authors.initials: R
authors.lastname: Takam
authors.forename: E
authors.initials: E
authors.lastname: Bezak
authors.forename: G
authors.initials: G
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Marcu
mesh_terms: D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis / Q000295:instrumentation*; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D005898:Glass / Q000737:chemistry / Q000528:radiation effects; D018020:Lithium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D010315:Particle Accelerators / Q000295:instrumentation*; D011829:Radiation Dosage; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*
chemical_list: D018020:Lithium Compounds; C027651:lithium fluoride; D005459:Fluorides