Abstract
The method is described for estimating calibration factors used in the TLD neutron dose calculation algorithm in order to assess the personal neutron dose equivalent to radiation workers in a nuclear power plant in accordance with ICRP 60 recommendations. Neutron spectra were measured at several locations inside the reactor containment building of Youngkwang Unit 4 in Korea by using a Bonner multisphere spectrometer (BMS) system. Based on the fractional distribution of measured neutron fluence, four locations were selected for in situ TLI) calibration. TL responses for the four selected locations were calculated from the measured spectra and the reported fit response function of TLD-600. TL responses were also measured with Harshaw type 8806 albedo dosemeters mounted on the water phantom, and compared with the calculated TL responses. From the responses measured with Harshaw 8806 TLDs, thermal neutron fluence was evaluated, and used to adjust the neutron spectrum obtained with BMS. TL responses calculated for the adjusted neutron spectra showed an excellent consistency with the measured TL responses within 15% difference. Neutron calibration factors were calculated for the measured neutron spectra and the D 2 O-moderated 252 Cf spectrum, and used to calculate correction factors which ranged from 2.38 to 11.18 The correction actor estimated in this way for the known neutron spectrum at an area can he conveniently used to calculate the personal dose equivalent at the area from the calibration factor obtained for a calibration neutron spectrum.
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