A. Vejdani-Noghreiyan
[ 1 ] - The safety of a landmine detection system using graphite and polyethylene moderator
Background: Several landmine detection methods, based on nuclear techniques, have been suggested up to now. Neutron-induced gamma emission, neutron and gamma attenuation, and fast neutron backscattering are the nuclear methods used for landmine detection. In this paper an optimized (safe and effective) moderating structure using an 241Am-Be neutron source for detecting landmines has been invest...
[ 2 ] - Shielding studies on a total-body neutron activation facility
Background: Prompt gamma neutron activation analysis (PGNAA) is known as a non-invasive technique capable of measuring elemental concentration in voluminous samples in a short period of time. Also it is a valuable diagnostic tool for total body elemental measurements. 252Cf and 241Am-Be sources which are usually used in this method, generate not only neutrons, but also emit high-energy and unwa...
[ 3 ] - Evaluation of polyurethane composite shields effect on reducing the risk of cataract induction at head CT scan
Head computed tomography is a common diagnostic examination, which may cause lenticular opacity and cataracts. Cataract induction is one of the non-stochastic effects of radiation, that happens at threshold dose of 0.5 Gy. Recent studies illustrate that only irradiation to the sensitive (germinative) zone of the lens is a prerequisite to cataract development. Recently, the dose values absorbed ...
[ 4 ] - Studying dose equivalents of radio-sensitive organs in head and neck region during nasopharynx proton therapy using Monte Carlo MCNPX code
In the present work, dose equivalents of radiosensitive organs in head and neck region have been calculated during nasopharynx proton therapy. For this purpose, a middle-size tumor was designed with the use of clinical information, and was then incorporated into the adult male ICRP phantom. According to the medical data, eight radiation paths around the neck were selected. After that, appropria...
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