AKBAR ABBASI

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Papers by AKBAR ABBASI

Natural radioactivity levels and radiological hazards indices of chemical fertilizers commonly used in Upper Egypt

Journal of Radiation Research and Applied Sciences, 2014

In order to determine the radiological hazards indices of chemical fertilizers commonly used in U... more In order to determine the radiological hazards indices of chemical fertilizers commonly used in Upper Egypt, The concentrations of natural radionuclides 226 Ra, 232 Th and 40 K in seven types of chemical fertilizers used in Upper Egypt have been measured by gamma spectrometry using NaI (Tl) 3 00 Â 3 00 detector. The ranges of concentration levels of 226 Ra, 232 Th and 40 K were 12 ± 0.6e244 ± 12.6, 3 ± 0.2e99 ± 4.9, and 109 ± 5.5e670 ± 34 Bq kg À1 , respectively. In the other side, the range values obtained from fertilizer samples under investigation were (33.1e392.3 Bq kg À1), (0.6e2.7), (15.6e177.8 nGy h À1) and (20.1e229.1 mSv y À1) for radium equivalent activity, g-radiation hazard index I gr , Dose rate (nGy h À1) and annual effective dose equivalent (AED) in the air to the occupational workers, respectively. The obtained values were compared with available reported data from other countries in literature.

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Lifetime risk assessment of Radium-226 in drinking water samples

Iranian Journal of Radiation Research, 2019

Background: One of the most significant radionuclides in natural drinking waters is Ra and its de... more Background: One of the most significant radionuclides in natural drinking waters is Ra and its decay products. It is potential of health problems, including cancer risk. In this study, the effect of Ra concentration in 28 drinking water samples collected from the North Guilan province was investigated. Materials and Methods: The activity concentrations of Ra were measured by using of radon emanation method and Pylon AB-5 radon scintillation detector. The annual effective dose distribution by age groups, radiological risk and chemical toxicity risk were calculated in drinking water. Results: The activity concentration results range from a low limit of detection (LLD) 2.0±0.1 mBq l to 38.2±2.4 mBq l. Also, the annual effective dose distribution by age groups estimated results were from 1.8×10 Sv y for adults to 1.5×10 Sv y for infants. The radiological risk assessment results were 1.06×10 to 2.03×10 for morbidity risk, 7.32×10 to 1.40×10 for mortality risk. The chemical toxicity risk ...

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Spatial distribution and health risk assessment of toxic metals associated with receptor population density in street dust: a case study of Xiandao District, Changsha, Middle China

Environmental science and pollution research international, Jan 26, 2014

Spatial characteristics of the properties (dust organic material and pH), concentrations, and enr... more Spatial characteristics of the properties (dust organic material and pH), concentrations, and enrichment levels of toxic metals (Ni, Hg, Mn and As) in street dust from Xiandao District (Middle China) were investigated. Method of incorporating receptor population density into noncarcinogenic health risk assessment based on local land use map and geostatistics was developed to identify their priority pollutants/regions of concern. Mean enrichment factors of studied metals decreased in the order of Hg ≈ As > Mn > Ni. For noncarcinogenic effects, the exposure pathway which resulted in the highest levels of exposure risk for children and adults was ingestion except Hg (inhalation of vapors), followed by dermal contact and inhalation. Hazard indexes (HIs) for As, Hg, Mn, and Ni to children and adults revealed the following order: As > Hg > Mn > Ni. Mean HI for As exceeded safe level (1) for children, and the maximum HI (0.99) for Hg was most approached the safe level. Prior...

Modelling and calculation of risk due to radon concentration in residential houses, Nicosia, Cyprus

Journal of Radioanalytical and Nuclear Chemistry, 2022

Windcatcher Ventilation Computation and Indoor 222RN Concentration in Traditional Adobe Houses

Radiation Protection Dosimetry, 2021

Radon-based radiation is a significant issue that can affect resident health as a contributory so... more Radon-based radiation is a significant issue that can affect resident health as a contributory source of natural radiation from soil construction materials. This study investigates the effect of windcatchers on radon activity concentrations and radon exhalation rate from the soil surface in traditional adobe houses of Yazd, Iran. Radon concentrations were measured by passive detectors in 16 adobe houses. Computational fluid dynamics simulations were performed for different wind speed to calculate ventilation rate. The concentrations of 222Rn were in the ranges of 22 ± 1–117 ± 8 Bq m−3 with an average value of 50 ± 3 Bq m−3. The radon exhalation rates values were in the range of 8.3 ± 0.1 to 47.2 ± 0.5 Bq m−2 h−1. Radon concentration results in only one dwelling site were higher than the level recommended by the World Health Organization. The annual radon inhalation dose was found in seven sites higher than the worldwide average.

Experimental and Simulation of Gamma Radiation Dose Rate for High Exposure Building Material

Natural radioactivity concentrations in high exposure building materials are commonly used in Ira... more Natural radioactivity concentrations in high exposure building materials are commonly used in Iran, which is measured a direct exposure by using γ-ray spectrometry. The values for 226 Ra, 232 Th and 40 K were in the ranges 3.8-94.2, 6.5-172.2 and 556.9-1539.2 Bqkg-1 , respectively. The absorbed dose rates in the standard dwelling room due to 238 U, 232 Th series and 40 K were calculated with MCNPX code. The simulation and experimental results were between 7.95-41.74 and 8.36-39.99 nGy h-1 , respectively. These results were compared with experimental outing and there was overlap closely. The simulation results are able to develop for any kind of dwelling places.

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Environmental radiation in high exposure building materials

In this thesis, we investigated the specific radioactivity concentrations of Ra, Th and K in diff... more In this thesis, we investigated the specific radioactivity concentrations of Ra, Th and K in different types of commonly used granite stone samples collected from the Tehran city of Iran by means of a high-resolution HPGe gamma-spectroscopy system. The result of Th, Ra and K are ranged from 18 to 178, 6 to 160 and 556 to1539 Bq kg -, respectively. The radium equivalent activities ( ) are lower than the limit of 370 Bq kg -set by NEA (Nuclear Energy Agency, OECD 1979) except in two samples. The internal hazard indexes have been found well below the acceptable limit in most of the samples. Five samples of investigated commercial granite stones do not satisfy the safety criterion illustrated by UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation, 1993). Applying dose criteria recently recommended by the EC [European Commission (1999)] for superficial materials, all investigated samples meet the exemption dose limit of 0.3 mSv y -. Also in this thesis, health hazards from gamma radiation doses due to granite and radon concentration have been calculated. The dose rate of exposure from granite building materials on humans is obtained as a result of an external exposure from gamma-emitting radionuclides in the granites. Another mode of exposure is from the inhalation of the decay products of Rn and Rn. The radon exhalation rates have also been studied and values were in the range of 0.32±0.01 to 7.86±1.65 Bq m -h -. For two models of standard living rooms (5.0 m×4.0 m area; 2.8 m), the radon concentration ( and the absorbed dose ( ) rates were calculated and the results were found to be 10.64-29.32 Bq m -, 3.84-68.02 nGy h -and 0.02-0.33 mSv y -for iv Model 1, 10.07-15.38 Bq m -and 2.29-39.99 nGy h -for Model 2, respectively. According to our estimations, mechanical ventilation systems ( ) in a room all granite samples would produce radon concentration of <100 Bq m -. Finally, radon exhalation rates and radon concentrations in selected granite stones were measured by means of a gamma-spectroscopy system (passive method) and an AlphaGUARD (active method). The radon exhalation rates measured by the passive and active methods were compared and the results of this study were similar, with the active method being 22 % higher than the passive method.

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Nuclear Fuel Transmutation

Nuclear power plants to generates electric energy used nuclear fuel such as Uranium Oxide (UOX). ... more Nuclear power plants to generates electric energy used nuclear fuel such as Uranium Oxide (UOX). A typical VVER-1000 reactor uses about 20-25 tons of spent fuel per year. The fuel transmutation of UOX fuel was evaluated by VISTA computer code. In this estimation the front end and back end components of fuel cycle was calculated. The front end of the cycle parameter are FF requirements, enrichment value requirements, depleted uranium amount, conversion requirements and natural uranium requirements. The back-end component is Spent Fuel (SF), Actinide Inventory (AI) and Fission Product (FP) radioisotopes.

Investigating the Effect of Self-,Peer-,and Teacher Assessment in Second Language Writing Over Time: A MultifacetRasch Approach. Paper presented at the 12th Tellsi International Conference, Zahedan, Iran

This study investigated the accuracy of scores assigned by self-, peer-, and teacher assessors ov... more This study investigated the accuracy of scores assigned by self-, peer-, and teacher assessors over time. Thirty-three English majors who were taking the paragraph development course at Vali-e-Asr University of Rafsanjan (VRU) and two instructors who had been teaching essay writing for at least two years at VRU, participated in the study. After receiving instructions on paragraph development, participants were trained for a session on how to rate the paragraphs. For three sessions the students were given topics to write about and were asked to rate their own and one of their peers' papers for mechanics, grammar and choice of words, content development, and organization. The teachers also rated the paragraphs according to the same criteria. Multifaceted Rasch measurement was employed to analyze the data. The results showed different patterns of performance for the subjects rated by different raters at the beginning of the experiment. However, rater bias showed significant decrease across time. The results of the study have useful implications for language teachers especially in portfolio assessment where self and peer assessment provide invaluable help.

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Nuclear Radiation Monitoring in the Heterogeneous Internet of Things Era

Real-Time Intelligence for Heterogeneous Networks, 2021

Estimation of natural gas contribution in indoor 222Rn concentration level in residential houses

Journal of Radioanalytical and Nuclear Chemistry

Radon concentration in compressed natural gas and liquefied petroleum gas and its release range in residential houses

Radiochimica Acta

Radon (222Rn) exposure in the environment is an important issue, and many pathways exist for rado... more Radon (222Rn) exposure in the environment is an important issue, and many pathways exist for radon exposure to humans. One of these pathways is 222Rn release through the consumption of natural gas. The issues of 222Rn concentration measurement techniques and worldwide concentration distribution were reviewed in natural gas, with emphasis on performing an active method to determine 222Rn concentration in LPG and CNG gases used in Cyprus. The obtained results were compared with 222Rn concentration in natural gas worldwide and UNSCEAR reports. The average 222Rn concentration value in LPG gas was observed higher than CNG gas. Also, the 222Rn concentration in LPG and CNG gases was less than the UNSCEAR reported value.

Trace element concentration and Al/Fe ratio in sediments of the South East Mediterranean Sea

Marine Pollution Bulletin

Baseline levels of natural radionuclides concentration in sediments East coastline of North Cyprus

Marine Pollution Bulletin

A review of the analytical methodology to determine Radium-226 and Radium-228 in drinking waters

Radiochimica Acta

Radium-228 (228Ra) and Radium-226 (226Ra) isotopes in drinking water are significant from the asp... more Radium-228 (228Ra) and Radium-226 (226Ra) isotopes in drinking water are significant from the aspect of radiation protection and human health. In this paper, the three most common preconcentration methods, i.e.coprecipitation, absorption and evaporation, were reviewed with emphasis on routinely measurement techniques. The reviewed measurement techniques include low background γ-spectrometry, α-spectrometry and liquid scintillation counting. The γ-spectrometry technique is the good selection, when the maximum sensitivity is considered. The Environmental Protection Agency guideline has provided the maximum concentration level 0.74 Bq/L for 226Ra and 228Ra. Also, the World Health Organization guideline limit is 1 Bq/L and 0.1 Bq/L for 226Ra and 228Ra, respectively.

Potential activity of free and PLGA/PEG nanoencapsulated nasturtium officinale extract in inducing cytotoxicity and apoptosis in human lung carcinoma A549 cells

Journal of Drug Delivery Science and Technology

Levels of Radon and Granite Building Materials

Radon

Influences of COVID-19 pandemic lockdown on excess lifetime cancer risk value of natural radiation

Journal of Radioanalytical and Nuclear Chemistry

This study focuses on the consequences of the COVID-19 pandemic on annual effective doses and exc... more This study focuses on the consequences of the COVID-19 pandemic on annual effective doses and excess lifetime cancer risk values due to ionizing radiation and radon which has been reported UNSCEAR 2000. The random data collection questionnaire method was applied to assess the indoor and outdoor occupancy factor for three age groups during the epidemic in Turkey. The results indicated age group C (Age > 65 y) has more influence from pandemic indoor and outdoor occupancy factor. As compared to before pandemic data in study area and global average exposure to natural radioactive sources.

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Estimation of cancer risk due to radiation exposure for some daily consumption of foods

Journal of Cancer Research and Therapeutics

Some physicochemical parameters and 226Ra concentration in groundwater samples of North Guilan, Iran

Chemosphere

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