Background: The anatomic position and proven radiosensitivity of the thyroid make it an organ of concern in dental X-ray examinations. A National Radiation Protection Department (NRPD)-sponsored pilot study carried out in the Dental Radiology Department of RUMS., to assess if the radiation dose in panoramic radiographies could be reduced without significant impairment of the subjective image qu...

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...

introduction:  skin  sparing  is  one  of  the  most  desirable  characteristics  of  high  energy  photon  beams. however, the photons emerging from the target of linacs are contaminated by secondary  electrons  as  a  result  of  their  interactions  with  air,  collimators,  flattening  filter  and  any  other  objects in their path. this phenomenon tends to increase the skin dose received b...

introduction: the aim of present study was to estimate effective dose from most common procedures performed in nuclear medicine departments of golestan province. methods: data of nuclear medicine procedures performed in 2 nuclear medicine departments in golestan province were collected during 4 years. effective dose, collective effective dose and effective dose per examination were calculated u...

abstractbackground: 226 ra and 228 ra contents in foodstuffs of ramsar which is a coastal city in the northern part of iran were determined by gamma spectrometry. measurement results together with food consumption rates were used to estimate annual effective dose from  226 ra and 228 ra, due to consumption of food stuffs by inhabitants of ramsar city.materials and methods: a total of 33 samples...

Uncertainty in estimates of internal doses to can arise for a variety of reasons, which include a lack of knowledge about assumed model parameters, uncertainty in exposure conditions, paucity of measurement data, and variability between individuals. In some cases, for example, causation or epidemiological studies, it is essential to be able to quantify this uncertainty for each individual in th...

Background: Phototherapy is an important modality in dermatology and the number of skin diseases which can be controlled with it is increasing. In order to start treatment, the first dose of phototherapy is determined by measurement of minimal erythema dose (MED) in each patients individually or according to patient’s skin type. Objective: To determine the relationship of skin type with MED in ...

introduction: the relation between patient body mass index (bmi) and the external dose rate of thyroid cancer patients treated with 131i has been investigated. methods: a total of 183 patients treated with 131i were selected randomly and divided according to their administrated activity into three groups: 3.7gbq, 5.5gbq and 7.4gbq. they were also stratified into three groups according to their...

INTRODUCTION Results of use of methodology for VMAT commissioning and quality assurance, utilizing both control point tests and dosimetric measurements are presented. METHODS AND MATERIALS A generalizable, phantom measurement approach is used to characterize the accuracy of the measurement system. Correction for angular response of the measurement system and inclusion of couch structures are ...