فهرست مطالب نقی جباری وصال

The widespread use of electromagnetic waves in human life has required the scientific research in the effects of these waves on the health of living beings. Due to the widespread use of these waves and the contradictory results in various researches, more comprehensive investigations are needed in this field. Therefore, the aim of this study was to evaluate the effect of 100µT magnetic fields on blood sample parameters such as: Cortisol, Blood Sugar, Triiodothyronine, and Thyroxin hormones in rat.
The study was conducted on 24 male rats (7-8 weeks old). The animals were randomly divided into two equal groups: experimental group and control group. The experimental group was exposed in a 100 micro-Tesla magnetic field, and control group was exposed in the quasi field in the same conditions. At the end of the experiment, all rats were scarifies, and blood samples were drawn.
Statistical analysis indicated that there were significant differences between both experimental and control groups on Cortisol (P The results of this study indicated significant decreases in the level of Cortisol and blood glucose and an increase in the level of Triiodothyronine hormones due to the magnetic fields. Since Cortisol is a hormone that can affect blood pressure and blood sugar, these variations can effect on human health.

Background and By increasing use of X-ray in medical diagnosis, it is essential to gain awareness on the amount of absorbed dose in patients according to the world standard levels. The aim of this study was to estimate the entrance surface dose (ESD) and effective dose (ED) of the patients in imaging (chest and abdomen) with diagnostic radiology systems in Hamadan, Iran; and comparing the results with those reported from other cities of Iran and the safety standards proposed by International Atomic Energy Agency (IAEA).
The participants included 10 patients attending Hamedan radiology centers. Three thermoluminescent dosimeters (TLD) were used to measure the dose of each patient. The measurements were performed for each organ and system and the information of patients, system, and exposure conditions was recorded. Then, the ESD and ED values were calculated and the results were compared with those reported by other studies and the IAEA standard levels.
The ESD values showed no significant difference between various models of radiology systems (P>0.05). The mean ESD values in current study for chest and abdomen X-ray were 0.43±0.09 and 2.51±0.19 mGy, repectively. The mean ED values for chest and abdomen radiology were 0.05 and 0.33 mSv, respectively.
The ESD value calculated for chest X-ray was higher than that suggested by IAEA, but this value for abdomen was found to be lower than that accepted by IAEA. Moreover, the mean ED values for both chest and abdomen radiology examinations were lower than those proposed by the IAEA.