DETERMINATION OF NEUTRON ROOM SCATTERING CORRECTIONS IN RCLS CALIBRATION FACILITY AT KAERI

Neutron room scattering corrections that should be made when neutron d etectors are calibrated with a D2O moderated Cf-252 neutron source in the centre of a calibration room are considered. Such room scattering corrections are dependent on specific neutron source type, detector ty pe, calibration distance, and calibration room configuration. Room sca ttering corrections for the responses of thermoluminescence dosemeter and two different types of spherical detectors to a neutron source in the Radiation Calibration Laboratory (RCL) neutron calibration facilit y at the Korea Atomic Energy Research Institute (KAERI) were experimen tally determined and are presented. The measured room scattering resul ts are then compared with theoretical results calculated by predicting room scattering effects in terms of parameters related to the specifi c configuration. Agreement between measured and calculated scattering correction is generally about 10% for three kinds of detectors in the calibration facility.