Interaction of fast neutrons with oxygen atoms of cooling water in reactor core leads to the production of 16N isotope which emits 6.13 MeV gamma ray. A system is developed to measure the 16N gamma ray activity using a5.08cm ×5.08cm NaI(Tl) detector. A suitable electronic system is used to count 16N gamma rays in different reactor powers in order to calibrate the 16N system in terms of reacto...

Background and purpose:  Background radiation exists naturally in the environment and human has been always exposed to it. These rays can affect living creatures and cause chromosomal damage, and genetic and somatic diseases. Hot water springs are a major source of background radiation. This study aimed at investigating the absorbed dose of environmental gamma and determining the annual effecti...

 In this work structural, electronic and magnetic properties of alpha and gamma phases of cerium crystal have been calculated by means of the LDA and LDA+U methods. The equilibrium volume and magnetic moment obtained from the GGA approximation in agreement with the experiment are equal to 27.64 Å3 and 0.00018 µB, respectively. This agreement shows that the 4f electrons in alpha phase are itiner...

Nowadays, PGNAA applications in industrial, medicine, military,… are well known. A PGNAA system design requires simulations to determining some parameters, like gamma spectrum originated from shield, sample and surrounding materials, to ability, for example, to foreseen minimum detectable activity. Simulation codes use cross section libraries for calculating interaction probabilities and...

Bipolar junction transistors (BJTs) are active semiconductor devices commonly used for amplification and switching applications. In this study, transistors have been biased to operate in active region and by measuring the electrical characteristics of BJTs, the effect of gamma irradiation on each of these characteristics was investigated before and after the gamma irradiation by 60Co source. In...

Background and Aims: Geographic tongue is a common inflammatory disorder of the tongue whose etiology is unknown. In this study, salivary levels of interferon-gamma were measured in persons with geographic tongue. Materials and Methods: In this case-control study, 30 persons with geographic tongue and 30 healthy individuals who had the conditions to enter the study were evaluated among the pati...