Nizar Adnan Al-Liabi

Abstract: The effects of storage temperatures on the track registration of CR-39 as a solid state nuclear track detectors have been investigated. The results show that the storage CR-39 detectors cause partial or complete removal of tracks depending on storaged time and temperatures. The bulk activation energy for CR-39 has been found to be 0.883 eV.

Abstract: The pre-irradiation annealing was studied in the temperature range of 100 ... 350 °C for silicate glass at different annealing times. The annealing raising the tracks density. The optimum annealing temperature was 250 "C. The annealing time was found to be hardly effected at the first hundred hours. The preannealing was found to be the hardness of the silicate glass so that the bulk etching rate decreases. The activation energy for bulk etching was found to be (0.3135 eV), the annealing did not change its value.

Abstract: A comparison of the etching -parameters as ivell as the neutron response for Makrofol-E and GR-39 was considered as solid slate nuclear track detectors. The calculated sensitivity for both detectors was compared with the measured one. It is found that GH-39 has higher response to fast neutrons titan Makrofol-E. Tlie response increase due to decreasing the rate of layer removed and increasing the etch-pits per unit area.

Abstract: Emission rate of fast neutrons from 5 Ci Am-Be neutron source has been studied using Lit 115 type II as a solid state nuclear track detector. The analysis sltows an anisotropic emission rate from the source, with a difference in the total annular emission rate at different jiositions from the source. The anisotropy and the difference in the total annular emission rate at different positions from the source may be due to non-uniform mixing and/or non-uniform distribution of Am-lie inside the inner can of the source.

Abstract: Bromine doped SnO, coatings are prepared using spray pyrolysis technique. The absorption coefficient is calculated in the fundamental absorption region. The absorption coefficient data are analysed and interpreted in terms of direct and indirect allowed transitions. Solar spectrum transmittance, reflection coefficient, refractive index, and figure of merit are estimated.

Abstract: The neutron sensitivity as well as minimum and maximum detectable doses for various types oj fission fragment track detectors and recoil track detectors has been compared. Tlic calculated sensitivity for each category was compared with the measured one. The sensitivities for recoil track detectors was found lo be higher than that for fission fragment track detectors. The parameters affecting the registration efficiency has been discussed

Abstract: Thermal, intermediate and fast neutron fluxes from Pu-Be neutron source has been measured inside a tissue-equivalent phantom using solid state nuclear track detectors. The fluence-dose conversion factors as well as related quality factors were used for absorbed dose and dose equivalent calculations. The experimental results were found to be in fair agreement with theoretical calculations. The contribution of thermal and intermediate neutron dose is lower relative to that for fast neutrons.

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