|
|
|
 |
Search published articles |
 |
|
Showing 10 results for Hassan
A.h. Barati, M.mokhtari -Dizaji, H.mozdarani, S.z. Bathaei, Z.m.hassan,
Volume 3, Issue 4 (March 2006)
Abstract
ABSTRACT Background : In order to quantify effects of ultrasound irradiation parameters under therapeutic condition, especially sonodynamic therapy, it is initially necessary to evaluate inertial cavitation activity in vitro conditions therefore, in this study, the effect of 1 MHz low level ultrasound based on °OH radicals generated by acoustic inertial cavitation in aqueous solution was monitored by their reaction with terephthalic acid (TA) to produce fluorescent 2-Hydroxyterephthalate acid (HTA) by spectrofluorometry method (Terephtalic acid dosimetry). Materials and Methods: The study was designed to measure hydroxyl radicals in a field near to 1 MHz sonotherapy probe in progressive mode and low level intensity. The effect of ultrasound irradiation parameters (1MHz) containing duty factor, mode, intensity ultrasound and, time sonication in hydroxyl radical production have been considered. After preparation of solution of dosimetry and plotting calibration curve of spectrofluorescence, the effect of mode of sonication (continuous and pulsating), duty factor (20-80%), intensity (0-2 W/cm2, with step of 0.5 W/cm2), and sonication time (0-60min with step time of 10min) without increasing temperature to more than 3°C to determine the effective exposure in low level ultrasound were evaluated. The fluorescence intensity of TA solution before and after irradiation, in all cases was measured, and the results were reported as Mean ± Standard Deviation (SD). Result : The result of experiments related to sonication mode for 1MHz ultrasound irradiation (2 W/cm2) show that continuous mode of sonication is 29% higher fluorescence intensity than the pulse mode in 80% duty cycle for sonodynamic therapy. With compensation of irradiation time for 1MHz sonication in different duty cycles, fluorescence intensity in continuous mode is 22% higher than the pulse mode in average. The amount of hydroxyl radicals production versus ultrasound intensity, and sonication time show with increasing intensity or sonication time in continuous mode, the hydroxyl radical production is linearity increased (R=0.99). Conclusion: The results show that the terephthalic acid dosimetry is suitable for detecting and quantifying free hydroxyl radical as a criterion of inertial cavitation production over a range of condition in medical ultrasound fields.
S. Safaverdi, F. Roshani, M. Lamehi Rashti, Sh. Golkhoo, Z.m. Hassan, L. Langroudi,
Volume 7, Issue 1 (6-2009)
Abstract
Background: Trace elements play an important
role in a number of biological processes. Astaxanthin
(ASX), a carotoid pigment found in certain marine
plant and animals, has shown anti cancer and anti
free radical properties. This work intended to
understand the effect of Astaxanthin in breast cancer
(invasive ductal carcinoma, IDC) by using micro-pixe
method. For this aim the concentration of trace
elements were compared in healthy, cancerous and
cancer treated with astaxanthin in the breast and
liver tissues of breast cancer bearing mice, using
proton induced X-ray emission (PIXE). Materials and
Methods: Proton induced X-ray emission (PIXE) was
used in a study intending to compare the
concentration of trace elements in breast and liver
tissues of mice bearing tumor, three groups of mice:
healthy, cancerous, and cancerous treated by
astaxanthin, were considered. Astaxanthin was
supplied from Research Institute of women, Alzahra
University. Results: Comparing the untreated tumor
tissue, treatment with Astaxanthin significantly
decreased the amount Fe, P, S, and Ca elements
level in tumor tissue of the breast cancer. It is also
found that the concentrations of those elements in
liver of the untreated mice and the liver of treated
mice with astaxanthin were fairly equal. Astaxanthin
significantly decrease the accumulation of elements
in the site of tumor, and caused the breast cancer
cell membrane to lose their desire to collect the
elements from healthy tissues. Conclusion: The micro
-pixe technique could calculate elemental
concentrations in tissues. Changes in metallic
elements may affect microenvironment and cell
functions, which might led lead to cell degeneration
or death, the results shows that astaxanthin reduces
vital element concentration in tumor site, thus it
could be used as an anti tumor agent. Iran. J. Radiat.
Res., 2009 7 (1): 33-39
M. Fahiminia, R. Fouladi Fard, R. Ardani, A. Mohammadbeigi, Dr. K. Naddafi, M.s. Hassanvand,
Volume 14, Issue 4 (10-2016)
Abstract
Background: Inhalation of radon and its short-lived decay products is one of the most significant sources of exposure to natural radiation. Radon is the second cause of lung cancer in the populations. The present study was carried out under the projects of national radon, with the aim of determining the concentration of indoor in the city of Qom located in the central semi-arid region of Iran. Materials and Methods: Radon measurements were carried out in 123 dwellings using passive sampling with CR-39 detectors for 90 days. The map of radon concentration distribution was prepared using Arc GIS software and the statistical analysis was performed with SPSS version 20. Results: Indoor radon concentrations in Qom dwellings ranged from 15–259 Bq m-3. The arithmetic mean of indoor radon concentrations on basement, ground floors, first floors and second and upper floors were 123.43, 87.94, 63.72 and 40.69 Bq m-3, respectively. Conclusion: A correlation was found between the distances from fault zones and measured indoor radon concentration. In most of cases, radon values were lower in well- ventilated dwellings in comparison with poorly-ventilated ones. Moreover, high radon concentration levels were observed in basements. The results indicated that in 30 places (24.3% of cases), the radon concentrations were higher than the reference levels recommended by the World Health Organization (100 Bq m-3).
H. Hassanvand, M. Birjandi, A. Amiri, M.s. Hassanvand, Dr. B. Kamarehie,
Volume 17, Issue 4 (10-2019)
Abstract
Background: One of the most important natural sources of human exposure is inhalation of radon radioactive gas and its decay products in homes and at workplaces. According to the World Health Organization, radon is the second leading cause of lung cancer. This study is the first survey of indoor radon concentration in dwellings of the Aleshtar city (west of Iran). Materials and methods: In this work, radon concentrations were measured in 24 dwellings by using a passive method known as Alpha Track Detectors (ATDs) with CR-39 polycarbonate film for three months during the year 2016. In addition, the annual effective dose due to radon exposure was estimated for residents. Results: The indoor radon concentration ranged from 1.01 to 206.53 Bq/m3 with an average value of 55.19 Bq/m3 (CI (Confidence Interval) 95%: 31.46 - 78.92), and the average annual effective dose to the population in Aleshtar was estimated to be 1.39 mSv/y. According to the result of this study, there was a significant difference between apartment buildings and villas as well as between different floors in terms of the average radon concentration. Conclusion: It was found that radon concentration in 20.8% of dwellings was higher than the reference levels recommended by the World Health Organization (100 Bq/m3).
A.s. Alaboodi, N.a. Kadhim, Phd., A.a. Abojassim, A. Baqir Hassan,
Volume 18, Issue 1 (1-2020)
Abstract
Background: This research focuses on study of natural radioactivity (226Ra 238U, 232Th, 40K and 222Rn) in different types of water samples at Al-Hurrah City in Najaf province/Iraq using NaI (Tl) and RAD-7 detector. Materials and Methods: Samples have been collected from three major sources of water, City Water (Drinking Water), River Water and Underground Water. The daily consumption of these three sources by humans in construction materials determines the standards used to measure the Radiological Contamination in these sources such as Annual Effective Dose, Radium Equivalent, Absorbed Dose rate, External Hazard Indexes, Internal Hazard Indexes and Activity Concentration Index Due to Gamma Ray of long-live Radioisotopes. Results: The results show that the average of Radioactivity Concentration forRadium-232 were 1.84±0.39Bq/L, 2.31±0.43Bq/Land 7.15±1.88Bq/L, for Thorium-232 were 1.31±0.33Bq/L, 0.98±0.13Bq/Land 2.19±0.44Bq/L, for Potasium-40 were 9.07±1.32Bq/L, 22.29±2.93Bq/Land 40.89±8.93Bq/L and for Radon-222 were 35.5±0.00 mBq/L, 355.50±30.33 mBq/L and 712.00±97.20 mBq/L. Based on Gamma Radionuclides measurement, the mean annual effective doses of city water and river water are lower than the reference level of the effective dose recommended by the ICRP, while the mean annual effective doses of underground water were higher than the reference level of the effective dose recommended by the ICRP. Conclusion: Finally, the researcher found that all the radiological parameters such as Raeq, D, Hex, Hin and Iγ in the water samples were within the range the global limit, thus it’s safe to use in construction materials.
N. Hassanpour, V. Changizi, Ph.d., M. Gholami,
Volume 19, Issue 3 (7-2021)
Abstract
Background: Since the radionuclides concentration in teeth is a good indicator of the human body’s radioactive contamination, the purpose of this study was to measure the track density of alpha particles emitted from the human teeth and to assess the resulting cancer risk. Material and Methods: In this cross-section study, 93 permanent and unfilled tooth samples were collected from the patients residing in Khorramabad, Iran, and visiting dental clinics in this city. The alpha track density for the tooth samples was measured using CR-39 nuclear track detector. Annual effective dose (AED) and excess lifetime cancer risk (ELCR) were estimated based on the recommendations made by ICRP and UNSCEAR. Results: The mean alpha track density from 222Rn in patients’ teeth was410.15 tracks cm-2, whereas the mean for women and men equaled 441.42 and 378.20, respectively. This difference was not statistically significant (P=0.22), but there was a statistically significant difference between the track densities in different age groups (P˂0.001).In this study, the average radon activity concentration was 40.62 Bq m-3. Also, the mean annual effective dose and the mean ELCR were calculated as 1.02 mSvy-1 and 3.59 ×10-3, respectively. Conclusion: The AED value was higher than the permissible dose limit and also the mean ELCR was higher than the global average. Based on the results, it is necessary to perform periodical monitoring to detect pollution sources.
M.m.m. Ali, Ph.d., H. Zhao, A. Rawashdeh, Y.a. Mohammed, M. Al Hassan,
Volume 19, Issue 3 (7-2021)
Abstract
Background: This study aimed to investigate the radiation hazard indices from sand samples of Ma’rib Governorate in Yemen, where the majority of oil and gas facilities are installed. Methods and Materials: Thirty five samples of desert sand from Ma’rib Governorate in Yemen were collected and tested their radiation hazard indices by using High Purity Germanium (HPGe) detector. Results: Based on the measurement of the concentrations of 226Ra, 232Th, and 40K, the radium equivalent activity (Raeq), the activity concentration index (Iγ), the external hazard index (Hex) and the internal hazard index (Hin) were all calculated. Also, the absorbed dose rate in Air (ADR) and the annual effective dose (AED) are calculated. Conclusions: Comparing the practically attained results with internationally permissible values, it was found that most of the radiological parameters, including the radiation hazard indices of the studied samples, fall within the world's permissible limits and don't expose risks to the human beings and environments.
F. Panahi, M. Mohammadi, F. Naserpour, N. Hassanpour, Ph.d., M. Gholami,
Volume 19, Issue 4 (10-2021)
Abstract
Background: This study aimed to determine entrance surface dose (ESD), calculate effective dose (ED), organ dose, and local dose levels in three general hospitals of Khorramabad in common diagnostic radiographic examinations, including Chest and Skull. Materials and Methods: Exposure parameters and data of 110 patients were collected during 6 months. In this study, three radiological devices including Shimadzu R-20, Mehran Teb DMT II and Varian Rad-8, were evaluated. Four radiographic views, including Chest posterior-anterior and lateral projections (PA/LAT), and Skull PA/LAT were also assessed. The index used for comparison and measurement of radiation dose was ESD measured using thermo luminescent dosimeter (TLD). In this study, a pc program for X-ray Monte Carlo (PCXMC) software was used to calculate the organs’ dose and effective dose. Results: The results obtained show that there is a significant relationship between mAs and kVp changes with ED and ESD values. ESD range in Chest PA, Chest LAT, Skull PA, and Skull LAT examinations were 0.1075-0.8844, 0.2059-2.2997, 0.0729-1.44, and 0.03478-1.15 mGy, respectively. In this study, the mean ESD estimated was lower than the diagnostic reference levels (DRLs) recommended by the National Radiological Protection Board (NRPB), the Commission of Europian Communities (CEC), and International Atomic Energy Agency (IAEA), but the ED calculated was relatively higher than other studies. Conclusion: A combination of experimental and simulation methods usually makes the accuracy of the dose estimates more reliable. The mean ESD estimated in this study is lower than the DRL published by NRPB, CEC, and IAEA. Also the published ED is almost more than other studies. The results of this study are used to optimize the dose level of patients.
Dr. M. Al Hassan, W.b. Liu, J. Wang, M.m.m. Ali, A. Rawashdeh,
Volume 20, Issue 3 (7-2022)
Abstract
Background: Recently, it has been demonstrated that thermosetting polymer composites have excellent gamma-rays shielding properties. Among them, phthalonitrile composites are the best suitable materials to replace the traditional shielding materials such as lead and concrete. Furthermore, tungsten-boride as high Z-material is an effective ionizing radiation shield. Materials and Methods: The gamma rays shielding properties of the phthalonitrile matrix (PH) reinforced with tungsten-boride (WB) at 661, 1172, and 1332 keV photon energies were investigated using MCNPX code and XCOM tool kit and compared to those of concrete as conventional shielding material and epoxy composites. MCNPX geometry was defined along the z-axis and described in the input file. The number of emitted photons was fixed at 107 at the source, which is supposed to be a monoenergetic point. Results: The simulated mass attenuation coefficients results are in good agreement with those calculated using the XCOM tool kit. Also, it was observed that at 661 keV photon energy, the shielding performances in term of Half-Value-Layer (HVL) are enhanced by3.08% and 22.01% for 30% and 50% of tungsten-boride concentrations compared to 30% of PbO concentration in the Epoxy-Clay composite and concrete respectively. Conclusion: In this study, the outstanding results of gamma-rays shielding properties of Phthalonitrile/WB composites (PHWB) obtained using MCNPX code and XCOM can be used for future experimental gamma-rays shielding approaches at a wide range of energy.
Assist. Prof. D. Kawthar Hassan Obayes,
Volume 22, Issue 1 (1-2024)
Abstract
Background: The radionuclide concentrations of 238U, 232Th, and 40K were measured in soil samples of some Governmental departments of Nasiriya city, at Thi Qar governorate Iraq. Materials and Methods: Using a NaI(Tl) detector, the specific activity of natural radionuclides in soil samples was evaluated. Results: The present investigation showed that the average values of specific activities (238U, 232Th, and 40K) were (5.37, 2.24, and 189.41 Bq/Kg), respectively. The averages values of the radiological hazards radium equivalent (Raeq), absorbed dose rate (Dγ), annual effective dose (AEDE), inside risk records (Hin), and external hazard index (Hex) were (23.16 Bq/kg, 11.96 nGy/h, 0.015 µSv/y, 0.059 µSv/y , 0.077, 0.063), respectively. Conclusion: According to these values, the results of the current study not exceeded the global permissible values of the natural radionuclides.
|
|
