Characterization of a two-dimensional, thermoluminescent, dose-mapping system: Uniformity, reproducibility, and calibrations

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1144558· OSTI ID:6957630

Fehl, D L; Muron, D J; Sujka, B R; Vehar, D W; Lorence, Jr, L J; Westfall, R L ^[1]; Jones, S C; Sweet, J A; Braunlich, P ^[2]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
2. International Sensor Technology, Inc., Pullman, Washington 99163 (United States)

Initial testing of a new, commercially available, thermoluminescent dosimetry system is reported. The radiation detectors consist of two-dimensional arrays of 10[sup 4] CaF[sub 2]:Mn dosimeters, deposited on flexible polyimide sheets. The spatial resolution is 3 mm, and the combined thickness of the dosimeters and the substrate is 185 [mu]m. Exposed sheets are processed by laser heating. This system is compatible with intense, pulsed Bremsstrahlung fields and electronics hardness testing. A two-step calibration procedure is described. In spatial uniformity tests at 66 Gy the detectors exhibited random fluctuations of 1%--3% superposed on broad spatial drifts of [similar to][plus minus]5%. Reproducibility for strips of 288 elements, cut from sheets and given absorbed doses of 100 Gy, was [similar to]2%. For absorbed doses in the 10 Gy--1.5 kGy range, response vs exposure curves show reasonable features of linearity, supralinearity, and saturation for CaF[sub 2]:Mn phosphor. Small systematic effects ([lt]7%) can be observed for sheets and strips stacked during exposure; these effects are explained by radiation transport calculations and impact the dosimetric technique.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6957630
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 65:10; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALKALINE EARTH METAL COMPOUNDS
BREMSSTRAHLUNG
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CALIBRATION
DOSEMETERS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEATING
LASER-RADIATION HEATING
LUMINESCENT DOSEMETERS
MANGANESE
MEASURING INSTRUMENTS
METALS
PHOSPHORS
PLASMA HEATING
RADIATION DETECTORS
RADIATIONS
THERMOLUMINESCENT DOSEMETERS
TRANSITION ELEMENTS