We explore the statistical uncertainty in low-dose-rate extrapolations of animal carcinogenicity data and state some general conclusions about its magnitude. Our conclu sions are based on analyses of both actual data sets from animal experiments and a large number of data sets gener ated by computer simulation. Our results, which should be applicable to continuous exposure to any â€oedirect-act...

BACKGROUND Immune suppression may be a critical effect associated with exposure to perfluorinated compounds (PFCs), as indicated by recent data on vaccine antibody responses in children. Therefore, this information may be crucial when deciding on exposure limits. METHODS Results obtained from follow-up of a Faroese birth cohort were used. Serum-PFC concentrations were measured at age 5 years,...

*Corresponding author: Dr. Asghar Mesbahi, Department of Medical Physics, Medical School, Tabriz university of Medical Sciences, Tabriz, Iran. Fax: +98 411 3364660 E-mail: [email protected] Background: Designing and shielding of an appropriate radiography room has been one of the major concerns of radiation scientists since the first decade after the invention of X-rays. Recently, report ...

aims: it was aimed to investigate postoperative conformal radiotherapy planning that provides the best target volume and the least dose for critical organs in cancers of stomach. methods: this study was conducted on the ct simulation images of thirty patients diagnosed with gastric cancer. target volumes and the organs at risk were contoured. ap-pa reciprocal parallel field conventional plan an...

Objectives: Published local control rates for certain stereotactic body radiotherapy (SBRT) lung cancer treatments have exceeded 97%, but several serious adverse events have been reported. No five-year normal tissue complication probability (NTCP) statistical analysis SBRT results have been published yet for skin. While we expectantly await these publications, the goal of this manuscript is to ...

Background: Compact cyclotrons are getting popular to fulfill enormous current demands of PET tracers. Aga Khan University Hospital, Karachi, Pakistan has acquired the first smallest footprint of BG-75 Generator for 18FDG-based PET/CT clinical imaging. We are sharing our experience of BG-75 in the first year (December 2015-November 2016) after commissioning. Mater...

The considerations leading to the recommendation of dose-equivalent limits by the International Commission for Radiological Protection are outlined. The dose-equivalent limits are based on radiation risk factors estimated from effects of radiation observed over many decades. These limits are designed to ensure that radiation exposure does not entail a greater risk than that experienced in other...