determination of room entry times for radiation therapists after routine 15 mv photon treatments

نویسندگان

m. najafi department of bioengineering and medical physics, shahid beheshti university of medical sciences, p. o. box 14155-6446, tehran, iran

mohammad reza deevband department of bioengineering and medical physics, shahid beheshti university of medical sciences, p. o. box 14155-6446, tehran, iran

a.a. yousefi diba department of radiation oncology, hafte tir hospital, p. o. box 1886718136, tehran, iran

a. amin moghaddam department of statistical, tarbiat-modares university, p. o. box 14115-111, tehran, iran

چکیده

background: radiation therapy  uses high-energy radiation to kill cancer cells. photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 mv. materials and methods: the gamma dose rates were measured after termination of different treatment approaches using 15 mv photons and room entry times for each approach was determined. based on the results of this study, the annual dose of radiation therapists was estimated. results: the highest dose rate that measured in the treatment room was belonged to 3-field pelvic approach which was equal to 5 ± 1.1 µsv/h. the radiation therapist's room entry times were determined between 3 to 10 minutes and the annual dose was estimated up to 5.9 msv/y. conclusion: although the estimated annual dose is less than the internationally permitted value, the undesirable dose to radiation workers could be reduced through considering recommended room entry times.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Determination of room entry times for radiation therapists after routine 15 MV photon treatments

Background: Radiation therapy  uses high-energy radiation to kill cancer cells. Photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 MV. Materials and Methods: The gamma dose rates were measured after termination of...

متن کامل

Evaluation of optimum room entry times for radiation therapists after high energy whole pelvic photon treatments.

OBJECTIVES Linear accelerators operating at or above 10 MV produce neutrons by photonuclear reactions and induce activation in machine components, which are a source of potential exposure for radiation therapists. This study estimated gamma dose contributions to radiation therapists during high energy, whole pelvic, photon beam treatments and determined the optimum room entry times, in terms of...

متن کامل

Evaluation of CorePlanTM treatment planning system for 6 and 15 MV photon irradiation

Introduction: Radiotherapy is an effective modality to treat esophageal carcinoma. Due to various inhomogenous tissues with a variety of physical and radiological properties which can cause uncertainty in accurate dose calculations in radiation therapy, accuracy of TPS is very important. The aim of this study was to quantify dose calculation accuracy of CoreplanTM TPS in an inh...

متن کامل

An analysis of 6-MV versus 18-MV photon energy plans for intensity-modulated radiation therapy (IMRT) of lung cancer.

PURPOSE To analyse the supposed benefits of low over high photon energies for the radiotherapy of lung cancer. MATERIALS AND METHODS For 13 patients, 6- and 18-MV IMRT planning was performed using identical planning objectives and dose constraints. Plans were compared according to dose-volume histogram (DVH) analysis including conformity and homogeneity indices (CI and HI) and overall plan qu...

متن کامل

comparison of lead and cerrobend blocks for incident photon flux of 6 and 15 mv x-rays

background: during radiotherapy treatment, critical organs are shielded using lead and cerrobend blocks. the objective of this study is to compare the effects of lead and cerrobend shielding blocks on incident photon beam. methods: collimator scatter factors were measured for open square fields (3 x 3 cm to 40 x 40 cm) defined by collimator jaws and for fields blocked down to smaller asymmetric...

متن کامل

Monte carlo simulation of varian clinac iX 10 MV photon beam for small field dosimetry

Background: The lack of lateral electronic disequilibrium (LED) becomes a main problem in small field. This factor affects the dose in target volume cannot predict correctly. In addition, utilization of high-energy linear accelerator (10 MV) can emit some unwanted particles (electron contamination). Therefore, the aim of this study was to characterize head linear accelerator (linac) Varian Clin...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
iranian journal of radiation research

جلد ۱۳، شماره ۴، صفحات ۳۷۹-۳۸۲

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023