Experimental determination of the fission-neutron fluence-to-dose conversion factor

Abstract

The experimental determination for the fission-neutron fluence-to-dose conversion factor was undertaken by a detector made of poly allyl diglycol carbonates (PADC). The detector's UV-response was correlated to set of reference γ-irradiated samples as a comparator. High neutron fluence from ETRR-2 research reactor was used while the comparator samples were irradiated using 60Co standard gamma-cell of calibrated dose rate. The gamma-ray dose ranged from 5×103 Gy to 3×106 Gy. Neutron fluence was monitored using iron by means of the 54Fe(n,p)54Mn and the 58Fe(n, γ)59Fe reactions. Results showed that the experimental value of the neutron fluence-to-dose conversion factor is (3.03 ± 0.06)×10−11 Gy cm2 over the whole energy spectrum of the fission neutrons from ETRR-2 reactor. Infrared investigation proved the effectiveness of UV-absorption in PADC detector for neutron monitoring purposes. The quantitative measurements showed that formation and fragmentation of the C=O, C=C and C-O-C atomic arrangements have the exact similar behavior under neutron as well as gamma-ray irradiation. These chromophores are best assesses using UV-absorption and treatment for direct-allowed transition energy. Experiments revealed a remnant signature for the dependence of hydrogen atom dissociation on the type of radiation that induced the modification.