Introduction: Breast cancer is the most common cancer among women. Brachytherapy is one of the ways to treat breast cancer. In brachytherapy treatments, high-dose sources are used in interstitial placement. Here, Iridium-192 is used. This source emits gamma rays with energies ranging from 136 kV to 1060 kV electron volts. The activity of the used spring is 10 Ci. The simulated ...

High dose rate brachytherapy has attained the good local control for cervix cancer because radioactive source can be put close to tumors, resulting in increasing the dose delivery per one fraction. However, quality assurance must be accompanied to reduce severe complication. We verified the dose distribution around the source by comparing measured dose with calculated dose by Radiation Therapy ...

INTRODUCTION " A permissible weekly dose is a dose of ionizing radiation accumulated in one week of such magnitude that, in the light of present knowledge, exposure at this weekly rate for an indefinite period of time, is not expected to cause appreciable bodily injury to a person at any time during his lifetime." This is a well-known recommendation as to the permissible dose from external sour...

background: natural radiation is constantly present in the environment and is emitted from a variety of natural and artificial sources. it affects human body and environment. materials and methods: the activity concentrations of 238u, 232th and 40k have been determined by gamma ray spectrometer with an hpge detector in sediments of cauvery river, tamilnadu, india. results: the absorbed dose rat...

background: high level radiation areas have been recognized on various parts of the earth. mahallat hot spring region is one of these areas. study of exposure in these areas can be helpful in investigating the effects of ionizing radiation. internal and external exposure to the staff was studied. materials and methods: used materials and instruments include: rss-112 ionizing chamber for environ...

introduction: ionizing radiation induces various kinds of dna damage in which may lead to chromosomal aberrations (ca). inspite of growing importance in the risk assessment, the dose yield kinetics of ca and their implications for dose assessment are not well established in exposures to low level radiation. in the present study, cytochalasin-b blocked micronucleus assay and metaphase analysis w...

BACKGROUND The Scripps Trial was a randomized study of intracoronary artery radiation therapy with iridium 192 used to treat restenotic vessels. We used the intravascular ultrasound data from the Scripps Trial to investigate whether a lumen-centered gamma or beta radiation source would reduce radiation dose heterogeneity compared with the noncentered source position used. METHODS Analysis inc...

background: prompt gamma neutron activation analysis (pgnaa) is known as a non-invasive technique capable of measuring elemental concentration in voluminous samples in a short period of time. also it is a valuable diagnostic tool for total body elemental measurements. 252cf and 241am-be sources which are usually used in this method, generate not only neutrons, but also emit high-energy and unwa...

Objective: Two main issues in protecting radiation workers and the general public from 18F radiation—distance from and lead shielding for an 18F source—were investigated. We also examined the effect of an 18F source on the counting rate of a neighboring -camera. Methods: The dose rates of an 18F vial and a water-filled cylinder were measured using an ionization chamber at different distances wi...