title: Neutron dosimetry with 6LiF-rich TL sheet.
abstract: A (6)LiF-rich thermoluminescent sheet-type dosemeter ((6)LiF-rich NTL sheet) was developed for neutron 2D dosimetry. The dosemeter utilises the (6)Li(n, alpha)(3)H reaction to detect thermal neutrons. Responses of the (6)LiF-rich NTL sheet to neutrons were measured at the neutron beam irradiation facility for BNCT in JRR-4 Research Reactor at the Japan Atomic Energy Research Institute. Placement of a multi-leaf collimator at the output port of the neutron (beam) irradiation facility, produced either stripe- or round-shaped neutron distributions; the spatial distribution was measured using the developed NTL sheets. Direct measurements of neutron attenuation in water were also carried out using the developed NTL sheet, submersed in a water phantom. In each experiment, NTL sheets having natural abundance (7.9%) of LiF, and (6)LiF-enriched NTL (18.94%) sheet were irradiated under the same conditions. The ratio of thermoluminescence intensities of the (6)LiF-rich NTL sheet to that of the normal NTL sheet was compared to a theoretically calculated value. The experimental measurements are shown to be in good agreement with the calculations.
authors.affiliation: National Maritime Research Institute, Mitaka, Tokyo 181-0004, Japan. konnai@nmri.go.jp
authors.forename: Akiko
authors.initials: A
authors.lastname: Konnai
authors.forename: Naoteru
authors.initials: N
authors.lastname: Odano
authors.forename: Nobuteru
authors.initials: N
authors.lastname: Nariyama
authors.forename: Seiki
authors.initials: S
authors.lastname: Ohnishi
authors.forename: Nobuya
authors.initials: N
authors.lastname: Nakajima
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Kishi
authors.forename: Naoto
authors.initials: N
authors.lastname: Ozasa
authors.forename: Yuhzoh
authors.initials: Y
authors.lastname: Ishikawa
mesh_terms: D016754:Boron Neutron Capture Therapy / Q000295:instrumentation*; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D018020:Lithium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008567:Membranes, Artificial; D009502:Neutrons / Q000627:therapeutic use*; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods
chemical_list: D018020:Lithium Compounds; D008567:Membranes, Artificial; C027651:lithium fluoride; D005459:Fluorides