Determination of Heavy water enrichment using PGNAA method

In this research by utilization the reaction(_1^1)H(n,γ)(_1^2)H was determined the heavy water enrichment. For this mean used the thermal neutron source obtained from Am-Be and moderating system that there is in nuclear physics laboratory in the Arak University. Moderator included a cubic of paraffin with dimension 50×50×50 cm3 and two outside layer included Boric acid with 2.5 cm thickness and 5 cm lead. The HPGe GCD30195 BSI detectors with 30% relative efficiency and corresponding electronic system MCB were used for registration of prompt γ- ray spectra. Heavy water samples with known enrichment as 0.01233%,13.5%, 35.2% and 58.2% were used to determine the linear calibration plot. In this research correlation coefficient obtained as R2= 0.99. Using the corresponding linear plot, were determined unknown enrichment heavy water as 57. 64 ± 0.02 mol%. The enrichment of D2O in this sample determined using FT-FR method that obtained 56.11±0.02 mol% which shows 1.53% disagreement.