Introduction Radioactive materials naturally exist in the world. Indeed, approximately 82% of human-absorbed radiation doses, which are out of human control, arise from natural sources of radiation including cosmic, terrestrial, and exposure through inhalation or ingestion. Thus, the aim of the present study was to estimate health risk, as well as the effective and organ doses from naturally oc...

background: radiation absorbed dose to the red bone marrow, a critical organ in the therapy of thyroid carcinoma, is generally kept below 2 gy for non-myeloablative therapies. the aim of this study was to calculate bone marrow radiation dose by using mirdose3 package program and to optimize the safe limit of activity to be administered to the thyroid cancer patients. materials and methods: in t...

Introduction The purpose of this study was to estimate organ and effective doses in patients undergoing some common X-ray examinations in Sabzevar, Iran. The effective dose is one of the best parameters for describing the amount of radiation dose received by a patient undergoing any diagnostic X-ray examination. The public dose from X-ray examinations depends on various factors, and its contrib...

abstract background and purpose: people are always exposed to ionizing radiation, which could badly influence their health. the degree of these influences depends on the level of radiations. in this study the dose of indoor gamma radiation was assessed using rds-110 multi-purpose survey meter. materials and methods: to determine the dose rate of indoor radiations in cities of hamedan province f...

background: in radiation therapy, water is the phantom material of choice, both for reference and for relative dosimetry measurements. solid phantoms, however, are more useful for routine measurements because they tend to be more robust and easier to set up than water phantoms. materials and methods: fluka input data cards have been arranged in sequential order. a simple cylindrical geometry wi...

Radiosurgery or stereotactic radiosurgery was invented by Swedish neurosurgeon Lars Leksell in 1951. defined as “delivery of a single, high dose irradiation to small and critically located intracranial volume through the intact skull.” His initial efforts were focused on developing noninvasive method create lesions within brain, using radiation rather than conventional blade. In 1968, first Gam...

Large-scale using of ionizing radiation for medical investigations has benefits and risks. Every country has national standards for radiation protection, defining responsibilities of individuals and organizations for radiation control. In spite of the rich legislation, the total cumulated dose absorbed by a patient during medical investigations is not cumulated or established in a unified manne...

abstractbackground: as fluoroscopy or different angiographies are usually evaluated using tl dosimeter. thismethod is a time-consuming procedure therefore, radiologists are usually worried and unawareof their exact radiation dose received during each fluoroscopy or angiography. in this study, anew trend for quick estimation of effective dose based on measuring air-absorbed dose of thescattered ...

background: the rejected films in radiography may be responsible for an unnecessary increase in the radiation dose to the population. the effective dose to population is a very important factor in estimation of stochastic risk in radiology. the main goal of this study was to determine the effective dose to members of the public due to rejected films in diagnostic radiology departments in the no...