Reza Pourimani - Academia.edu (original) (raw)

Papers by Reza Pourimani

The European physical journal plus, Jun 25, 2024

Radiation physics and chemistry, May 1, 2024

Deleted Journal, Apr 12, 2024

Elsevier, Dec 31, 2022

Molybdenum-99 is a critical radioisotope for producing diagnostic radiopharmaceuticals labeled by... more Molybdenum-99 is a critical radioisotope for producing diagnostic radiopharmaceuticals labeled by technetium-
99m. This study investigated the shielding of hot cells used in radiochemical process facilities for industrial 99Mo production via fission of domestic LEU targets. A calculation method based on MCNP6 simulations
was proposed and evaluated using some experimental data. The results showed that the calculated dose rate values
should be multiplied by 1.3 from a conservative point of view and then values compared with the permissible
dose rate limits. The ISODOSE graphs showed that although a one-layer hot cell with Barite concrete (BA) walls
of 80 cm is not enough for radiation-safe work on a hot batch, a one-layer hot cell of BA with 90 cm walls, two-layer BA(80 cm) + Lead(3 cm) and BA(80 cm) + Carbon steel (CS) (4.3 cm) and three-layer BA(80 cm) + CS(1.4
cm) + Lead(2 cm) could be suitable options.

Nuclear Engineering and Technology, May 1, 2023

European Physical Journal Plus, Feb 1, 2022

International Journal of Ecosystem, 2015

Plants can transfer radioactivity into human nutrient cycle and ecosystem directly by vegetable f... more Plants can transfer radioactivity into human nutrient cycle and ecosystem directly by vegetable food products and indirectly by animal food products. Also their role is important in absorption of environmental radioactive pollutants. Plant radioactivity is different based on soil and stone kind and geographical situation. Then subtle plant recognition of each environment can prepare valuable information for researchers. In this work the natural and artificial radioactivity concentrations of 226 Ra, 232 Th, 40 K and 137 Cs in 8 medicinal and edible plant species including:

Iranian Journal of Radiation Safety and Measurement, Jun 10, 2020

Iranian Journal of Science and Technology Transaction A-science, Nov 26, 2020

Lead and zinc ores are the most important natural raw materials widely used in the industry. Thes... more Lead and zinc ores are the most important natural raw materials widely used in the industry. These types of ores contain different amounts of radionuclides that expose workers to radiation during extraction, transport, and processing. In this study, 22 samples were collected, including 18 samples of lead-zinc ore and 4 samples of mining waste. Specific activities of 226 Ra, 232 Th, and 40 K were determined using a high-purity germanium gamma radiation detector (HPGe). The specific activities of corresponding radionuclides in lead-zinc ore samples varied in the range (\ 0.21-107.61), (1.91-48.13), and (\ 10.16-664.04) in Bq/kg, respectively. According to the European Commission's dose assessment instruction for workers, the effective dose absorption was calculated for different scenarios, as transport, outdoor storage, and internal storage, which varied from 0.76 to 10.23 lSv/y, 1.05-17.00 lSv/y, and 1.20-19.20 lSv/y, respectively. For all lead-zinc ore samples, effective doses in various scenarios were lower than the intervention level (1.0 9 10 3 lSv/y) determined by the International Commission on Radiological Protection.

DOAJ (DOAJ: Directory of Open Access Journals), May 1, 2019

The purpose of this study was to measure the radioactivity in the agricultural soil of southeast ... more The purpose of this study was to measure the radioactivity in the agricultural soil of southeast of Shazand Refinery Complex to determine both reliable baseline data on the radiation level and the radiation dose exposure to the farmers and inhabitants of the studied area. Material and Methods: This study was conducted on 21 soil samples collected from two different lands. Sampling spots in each land were selected for the assessment of specific activities of radionuclides of 226 Ra, 232 Th, 40 K, and 137 Cs by using high purity germanium detector setup. Standards of International Atomic Energy Agency references material gamma ray uranium, reference gamma-ray thorium, and reference gamma-ray potassium were used for quality control and determining efficiency calibration. All samples were examined for radium equivalent, absorbed gamma dose rate, internal hazard index, external radiation hazard, annual gonadal dose equivalent, indoor and outdoor annual effective dose equivalent, and excess lifetime cancer risk. Results: The specific activities of radionuclides 226 Ra, 232 Th, 40 K, and 137 Cs varied from13.12 to 33.03, 11.3 to 35.86, 257.82 to 605.5, and 1.28 to 13.36 Bq/kg, respectively. Moreover, the results of this study were compared with those reported from other countries and worldwide average. Conclusion: Although all samples were polluted by the 137 Cs fission product, the measured values were within the global reported safety limits. Therefore, there is no risk for farmers and inhabitants in this region.

Kerntechnik, Nov 30, 2022

Nowadays, reducing fuel consumption, fuel cost, and fuel waste is obtained by increasing the burn... more Nowadays, reducing fuel consumption, fuel cost, and fuel waste is obtained by increasing the burnup and reactor cycle length as essential goals in nuclear power plants. Due to the scarcity of Iran’s uranium resources and the plan for using new types of fuel in the Water–Water Energetic Reactors (WWER-1000) at Bushehr Nuclear Power Plant (BNPP), utilizing Integral Burnable Absorbers (IBAs) is of great importance. In the present study, a neutronic evaluation has been conducted to investigate the variations of infinite multiplication factor versus burnup, reactivity swing, and power distribution in various IBAs, including Gd2O3-UO2, Er2O3-UO2, and Dy2O3-UO2. The results were compared with the standard burnable absorber in the BNPP reactor core (CrB2Al). It can be concluded that gadolinium IBA, with a concentration of 5%, has the greatest effect on the initial reactivity and reduces the reactivity swing by 19% compared to the CrB2Al BA. In addition, by using coaxial gadolinium-erbium IBA pins, as well as optimizing the neutronic condition, the reactor cycle length increased by 1.01 GWd/MTU compared to the standard Bushehr BA.

Iranian Journal of Medical Physics, Mar 1, 2020

There are natural and artificial radioactive nuclei in our environment, as well as in the structu... more There are natural and artificial radioactive nuclei in our environment, as well as in the structure of the living organism. Currently, industrial and municipal pollution has also an impact on increasing the level of radiation. The present study investigated the effect of inlet water from Arak Wastewater Treatment Plant on international Meighan Wetland and assessed the radiological indicators of sediments and water samples in this area. Material and Methods: In this study, the specific activity of radionuclides in water and sediment samples taken from the water entry areas of the international Meighan wetland was determined using a high purity germanium detector (Baltic Scientific Instrument LTD, 005-Latvia). Radiological indices for collected samples were calculated, and the topographical maps of radiation dose distribution were plotted using Surfer software (version 13). Results: Specific activities of 226 Ra, 232 Th, 40 K, and 137 Cs in sediment samples were in the range of 14.44-26.58, 22.78-34.56, 360.84-447.79, and 0.7-13.03Bq kg ⁄ , respectively. The average values of the external hazard index for sediment samples were calculated at 0.25. Conclusion: According to the obtained results, it can be concluded that pollution is more embedded in the Treatment Plant's basin, and a small amount goes to the wetlands. Radioactivity in the research area is normal, and topographic maps show that the distance from the entrance reduces the activity of radium and increases the activity of cesium. Assessment of hazard indicators showed that radiation levels in this area are not dangerous to human health.

Iranian Journal of Medical Physics, Dec 1, 2016

Introduction Artificial and natural radionuclides are found in diverse environmental compartments... more Introduction Artificial and natural radionuclides are found in diverse environmental compartments, such as water, soil, rocks, vegetables, animals, and human body tissues. As such, humans and environments are at constant exposure of these radiation types. In this research investigated specific activities of radionuclide and dose assessment of some species of mushrooms. Materials and Methods In this study, natural and artificial radioactivity concentrations were determined in Agaricus bispora (nourished mushrooms), Cantharellus cibarius, Coprinus micaceus (wild fungi species) and their composts through gamma-ray spectrometry using a high-purity germanium (HPGe) detector with 30% relative efficiency. Results Radioactivity concentrations of 238 U and 232 Th in edible mushroom samples were lower than the minimum detectable activity (MDA). For 40 K and 137 Cs, these concentrations were within the ranges of 1895.24-1920.24and <0.45-0.72Bq/kg, respectively. Moreover, specific activities of 238 U, 232 Th, 40 K, and 137 Cs in the composts varied within the ranges of < 0.47-3.40, 6.59-7.82, 1166.12-1428.27, and 0.75-1.97±Bq/kg, respectively. Excess lifetime cancer risk due to the ingestion of nourished mushrooms was calculated as 1.28×10-4 , which is lower than the maximum acceptable value. Conclusion Results of this study showed that the radioactivity concentrations of edible mushrooms are close to or lower than MDA. In addition, radioactivity concentrations of the composts were indicative of the low pollution of the studied regions by radiocesium. Annual consumption rate threshold was calculated as 26.7 kg in dry weight (fresh weight: 267 kg). Therefore, it could be concluded that consumption of these mushrooms is associated with no health consequences for consumers.

European Physical Journal Plus, Oct 13, 2022

This study provides a discretized transmutation rate response function that is consistent with th... more This study provides a discretized transmutation rate response function that is consistent with the physics models used in MCNPX in order to circumvent a problem with reaction tallies not scoring in the model physics regime. This is used for the estimation of the transmutation rate of 99 Tc in an accelerator driven system containing protons and spallation neutrons with energies up to 1500 MeV. To compute the interaction response function, a modeling construct consisting of a very small 99 Tc target with a monodirectional neutron or proton source is used. The small size of the target allows attenuation and columbic energy loss to be ignored for the response function generation process. The transmutation rate responses for a total of 180 neutron energy bins ranging from 8.8 MeV to 1500 MeV and 120 proton energy bins ranging from 1 MeV to 1500 MeV are computed.

Journal of Instrumentation, Sep 1, 2022

A radiation-sensitive nickel nitrate complex gel was prepared in three concentrations, and dosime... more A radiation-sensitive nickel nitrate complex gel was prepared in three concentrations, and dosimetric characteristics were investigated for routine use in gamma radiation processing. Nickel nitrate hexahydrate/Gelatin/1,5-diphenylcarbazone (Ni/G/DPCO) gel demonstrated a maximum wavelength of 535 nm and linear dose-response of 10–1300 Gy. By increasing the absorbed dose, the Ni/G/DPCO gel has a visual color change from purple to colorless. The dose rate dependence on the gel sensitivity at 1.17 and 0.062 Gy/s dose rates was less than 10% difference at a linear dose range of 10–1300 Gy. Color stability before and after irradiation was up to 35 days, and the overall coefficient of variation, CV%, was found to be 3.87%. Hence, the observations proved that the gel has favorable characteristics for food irradiation, insect population control, and irradiation of agricultural products.