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Showing 2 results for Mayahi

M. Gholami, A. Maziar, H.r. Khosravi, F. Ebrahimzadeh, S. Mayahi,
Volume 13, Issue 1 (1-2015)
Abstract

Background: In diagnostic radiology there are two reasons for measuring or estimating radiation doses to patients. Firstly measurements provide a means for setting and checking standards of good practice as an aid to the optimization of patient protection. Secondly estimates of the absorbed dose to tissue and organs in the patients. Materials and Methods: A total of 2382 patients were studied to calculate the Entrance Surface Air Kerma (ESAK) following seven radiographic examinations including: chest (PA, Lat), lumbar spines (AP, Lat), pelvis (AP), abdomen (AP), skull (PA, Lat), thoracic spine (AP, Lat) and cervical spines (AP, Lat). The ESAKs values were measured according to x- ray tube output, optimized exposure parameters and body thickness (tp) for each technique. Results: The parameters such as, 1st quartile, mean, median, 3rd quartile, minimum, maximum and standard deviation of each ESAK values are reported and compared to NRPB guide levels. The results showed that the ESAKs values in the lumbar spines and chest X-ray examinations were 30% above the guide levels. However, for the pelvis (AP), skull (PA) and abdomen (AP) examinations, these values were below than those reported by the NRPB. Conclusion: Periodic quality control and monitoring the technical performance of radiographers might effectively improve the image quality and eventually reducing the dose received by patients.


H.j. Albazoni, Dr. B.a. Almayahi,
Volume 20, Issue 1 (1-2022)
Abstract

Background: This study is focused on the design and manufacture of a biosensor to detect the presence of the two chemicals Pb+2 and 222Rn in soil and building materials. Materials and Methods: The biosensor is used on the basis of primers (ssDNA with high guanine). These are different sequences of nitrogenous bases. Biosensor-Ι and biosensor-ΙΙ have sequences as follow: 5′-AGGGTTAGGGTTAGGGTTAGGG-′3 and 5′-GGTTGGTGTGGTTGG-′3, respectively. The results show that the average 222Rn (BIOS-ΙI) was higher than 222Rn (BIOS-Ι). The average Pb+2 (BIOS-Ι) was higher than Pb+2 (BIOS-ΙΙ). Results: The 222Rn and Pb+2 in the samples were ordered as following: Indian granite > soil loc 2 > Chinese granite > soil loc 1 > soil loc 3 > Iraqi mosaic > Iranian mosaic > Iraqi bricks > Iraqi thermostone blocks > Indian ceramic > cement1 > Iranian thermostone blocks > Turkish marble > Iranian ceramic > Iranian bricks > cement2 > Iranian marble. Conclusion: The levels of Pb+2 and 222Rn in Chinese and Indian granites are higher than the acceptable limits. This method can be used for detecting radioactive and organic materials. It can also exclude radiation damage from field testing.
 

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International Journal of Radiation Research
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