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Radiation Protection Dosimetry 20:95-98 (1987)
© 1987 Oxford University Press

The Bristol University Neutron Dosimetry System

A. Worley, A.P. Fews and D.L. Henshaw

The neutron dosimetry system developed at Bristol is approaching the stage of operational field trials. The system is based on recording recoil proton tracks in conventionally etched PADC plastic using a fully automated image analysis system developed in this laboratory. Two features contribute to the achievement of a low dose threshold: high quality plastic is manufactured in this laboratory and undergoes extensive quality control tests prior to acceptance for use in dosimetry, and a readout system with high efficiency for rejecting background events is used. The principal dosemeter that has been developed consists of three orthogonal elements, each containing two 3 cm x 1 cm plastics on either side of a polyethylene radiator. On each plastic an area of 0.15 cm2 is scanned giving a total active area of 0.90 cm2. Each plastic is coded in both arabic numerals for manual identification and a corresponding bar code for computer recognition. There is provision for the inclusion of a seventh pre-dosed plastic for calibration purposes. The track counts from the six plastics are added with different weightings to achieve a measure of dose which is independent of irradiation direction when worn on the body. The device has been calibrated using monoenergetic neutrons in the range 100 keV to 14.7 MeV at NPL, and using the recent CENDOS exposure. If the track counts are added without weighting, the device has a nominal response of 120 tracks cm-2.mSv-1 and an energy threshold at 200 keV. Taken together with a background of 20 track cm-2, a dose threshold of around 80 µSv is implied. A simpler dosemeter, using a single plastic/radiator combination, may also be considered. If a 1 cm2 device is used for normal incidence exposure the dose threshold is calculated to be 25 µSv. The lower figure is produced because the simpler device contains no plastics edge-on to the beam.


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