Evaluation of the fast neutron dose equivalent using the thermal neutron response of lithium fluoride TLD

For estimation of the fast neutron dose equivalent we used the albedo method which consists in the detection of the albedo thermal neutrons. The albedo neutrons are the fast neutrons which leave the body as thermal neutrons after having been scattered in the human body. The albedo neutrons are detected at the surface of the body by means of the detectors for thermal neutrons. For the measurement of the albedo thermal neutrons we used a Multifunctional Personal Dosemeter which contains 6 detectors of lithium fluoride with natural lithium. This has realized at Institute for Physics and Nuclear Engineering, in Bucharest. The detectors of lithium fluoride with natural lithium are sensible at the photon radiations, at the beta radiations and at the thermal neutrons. The discrimination is realised with the help of the filters. This dosemeter was designed so that with a suitable choice of Cd (0,8 mm), Sn (0.8 mm) and Al (1 mm) filters size and thickness he is suitable to measure the thermal neutron dose equivalent, the photon radiation dose equivalent and the beta radiation dose equivalent. (author)