On the use of TLD for gamma ray dosimetry evaluation in mixed fast neutron and gamma ray fields

Some assessments are provided on the use of thermoluminescence dosemeters (TLDs) for γ ray dosimetry evaluation in mixed (fast neutron-γ ray) radiation fields. Dosimetry measurements and calculations were performed in three different experimental arrangements driven by 252Cf sources. Measurements were made with TLD-200, TLD-400 and TLD-700. Various corrections including the TLD neutron sensitivities and the general cavity theory f factors were applied to the measurements. Calculations were performed using diffusion code 2DB and discrete ordinate transport codes ANISN and DOT. Good agreement was found between TLD-200, TLD-400 and TLD-700 results. Generic derivations were found between calculated and measured results. Analyses showed that, due to the inaccuracies in standard computational schemes, calculations underestimate the measured results. (author)