جستجوی مقالات مرتبط با کلیدواژه "radiation dose" در نشریات گروه "فیزیک"

One of the most important groups that can be exposed to nuclear radiation is pregnant women and their fetus. This group of people can be technicians at nuclear centers located in the patients undergoing treatment or nuclear medicine diagnostic centers. The purpose of the paper is to determine the rate of doses received by female technicians who are indirectly in the vicinity of nuclear radiation. In order to verify the results of computer simulation, a comparison was made with experimental results from the nuclear medicine department of Imam Hossein Hospital in Shahroud. The statistical analysis of the results showed that there was a significant difference between the simulation results and there are no experimental results.

This study was performed with the aim of determination of dose calibrators’ accuracy in nuclear medicine centers. Thallium-201 radiopharmaceutical was used for comparison of dose calibrators with each other and with the reference. After the measurement which was carried out in 12 centers located in tehran and other cities, and according to the data obtained from the reference, it was concluded that dose calibrators in 10 centers are with positive and 2 centers with negative errors, as compared with the reference.

Thermoluminescence dosimeters are well known for their widespread applications in dosimetry specially neutron dosimetry. In low neutron fluences it is usual to use (n,α) reaction for direct measurement of neutron fluence, but in higher values, some gray filters are necessary. And also supralinearity because of the high absorbed dose makes the direct reading of TLDs difficult. After anealing of dosimeters the absorbed dose from the internal activity was used as a mass for neutron fluence. In this work thermal neutron fluence in the range between 1011 and 1013 n/cm2 in the reactor core of Tehran Research Reactor was measured using TLD-600 thermoluminescence dosimeters. The influence of irradiation-induced damage effect on the response of TLDs and their subsequent readings have been minimized. The measurements were made reproducible in this manner. The induced TL-light reader due to self-activity in TLD-600 dependens on the neutron fluence caused a conveniently measurable TL glow curve. The accumulated TL-light was measured after storage periods of 24, 48 and 72 hours. A short theoretical treatment is also presented at this work.