Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : NaI

Evaluation of Natural Radioactivity in Selected Soil Samples from the Archaeological of Girsu City in Dhi-Qar Governorate, Iraq

Iman Tarik Al-Alawy; Manar Dhyeaa Salim

Engineering and Technology Journal, 2014, Volume 32, Issue 13, Pages 3120-3129

The specific activity of natural radionuclides in (18) soil samples collected from antiquities area of Girsu city in Dhi-Qar Governorate (31.0459863N, 46.2534257E) in southern Iraq have been studied and evaluated. Experimental results were obtained by using a gamma ray spectrometer analysis system consists
of a scintillation detector Sodium Iodide activated by Thallium NaI(Tl) of (3"×3") crystal dimension at the laboratory of radiation detection and measurement in Science Collage, University of Kufa. The spectrometer has been calibrated for energy by acquiring a spectrum from four standard sources of gamma radiations supplied by spectrum techniques (LLC). The measuring time of all soil samples is (18000 seconds), it was found that, for Girsu city the soil specific activity ranges from (22.68±3.94 to 14.69±2.24) Bq/kg for , from (17.41±2.23 to 11.23±2.34) Bq/kg for and from (346.49±10.68 to 266.96±10.55) Bq/kg for . The results have been compared with the acceptable data of the worldwide literatures. In order to evaluate the radiological hazard of the natural radioactivity, the radium equivalent activity (Raeq), the gamma absorbed dose rate (D), the annual effective dose rate and the both (external and internal) hazard index have been calculated and compared with the acceptable values of the worldwide average (UNSCEAR, 2000).

The Treatment of Efficiency of NaI(Tl) Detector By Using Monte Carlo Simulation

A. B. Kadhem; A. N. Mohammed

Engineering and Technology Journal, 2010, Volume 28, Issue 5, Pages 1001-1013

An efficient Monte Carlo computer program for simulation and calculation of the
total and full energy peak efficiency (absolute and intrinsic) of the cylindrical
NaI(Tl)detector (with different: volumes, source-detector separation and gamma rays
energies) is described. All the fundamental physical processes (photoelectric effect,
compton scattering effect and pair production effect) occurring inside the detector are
taken into account. Very fast analytical expressions for the absorption coefficients are
obtained. The same program can be used to calculate the response function of the
detector to gamma ray. The results show quite well agreement with experimental data
and with other calculations within error rate less than 2%. The results can be used in
gamma spectroscopy and determining the activity of sources.