Abstract
A simple personnel neutron dosimeter based on albedo principle was investigated. This dosimeter was designed to respond to the albedo neutrons and then the neutron dose was determined. The albedo dosimeter consists of a pair of TLD-600 and TLD-700 dosimeters from which the separate dose fraction of neutrons and gamma-rays can be evaluated. A capsule made of phenol resin with boron carbide was used as the shielding material, and the reading ratio of outer and inner TLD was used to determine the energy correction factor. Phantom irradiation was performed in the Am-Be, Pu-Be neutron fields, and the monoenergetic fast neutrons from the Van de Graaff accelerator as well. A Monte Carlo computer code was developed to simulate the experimental condition. In this study the albedo neutron dosimeter system proposed can be used for routine personnel monitoring, and the neutron dose-equivalent measured is within an overall error of ±40%.
