Ball Gamma-ray Angle Dt Neutron Irradiation Flux Spectrum

Angular flux spectra of gamma-ray from iron sphere with d-T neutron source at its center was measured with a NE-2 13 scintillation detector of dimension 45.08x5.O8cm. The angular flux spectra of leakage gamma-ray, in the range of 0.5-4.5MeV were obtained by applying reversal matrix approach on measured recoil electron spectra(RES). Response function of the scintillator for mono-energy gamma-ray was calculated with MARTHA codes and was checked with Compton RES of ?7Cs gamma- ray. The iron sphere was 36.2cm in diameter and 10cm in thickness. A collimator composed of Fe, polyethylene and lead was used. When its axis was deviated 0, 6 and 12cm from the d beam-line, it was 00,1940 and 41 5O with the normal of the sphere at corresponding intersections. Influence of gamma-ray produced by the target was discounted by combining of measurement and Monte-Carlo calculatidn. The total error of angular flux spectra of leakage gamma-ray of iron sphere was about 10-17%. Production and transportation of gamma-ray of iron sphere under d-T neutrons was simulated using MCNP codes with ENDFIB-IV, ENDL8S and t-2 libs. Leakage rate and spectra of gamma-ray from 4)36.2cm iron sphere were calculated using MCNP/4A codes with FENDL-2, t-2 and ENDF/B-V. The results were compared and commented. The three libs were used to calculate angular flux spectra in the measuring directions. The calculation were compared with experiment results. Generally, calculation of t-2 lib coincided better than that of FENDL-2 with measured results, and their angular distribution seemed to need further improvement.