Background: In high-intensity, mixed and pulsed neutron fields the use of spectrometers or area monitors with active detectors is useless in these conditions neutron measuring devices must have a passive detector. Here a passive neutron area monitor with CR39 track detector was designed and the response was calculated. Materials and Methods: The response of a passive neutron area monitor with C...

Large quantities of radiopharmaceuticals prescribed for treatment and diagnosis are excreted through kidney. Therefore, radiation unwanted dose is created in kidney. As a result, exact calculation of prescribed radiopharmaceuticals amount is important. Monte Carlo method is used for simulation of radiation transport in body due to random nature of radiation. In this research, for the first time...

In this study, the monotonic effect of Ta2O5 and ZrO2 in some selected borotellurite glasses was investigated terms their impact on gamma-ray-shielding competencies. Accordingly, three niobium-reinforced (S1 : 75TeO2 + 15B2O3 10Nb2O5, S2 9Nb2O5 1Ta2O5, S3 8Nb2O5 1Ta2O5 1ZrO2) were modelled general-purpose MCNPX Monte Carlo code. They have been defined as an attenuator sample between point isotr...

Abstract Purpose: Advanced radiation therapy techniques use small fields in treatment planning and delivery. Small have the advantage of more accurate dose delivery, but with cost some complications dosimetry. Different calculation algorithms imported various systems (TPSs) which each them has different accuracy. Monte Carlo (MC) simulation been reported as one methods for calculating distribut...

Radiotherapy of pregnant cancer patients is not common, but when applied accurate assessment the fetus dose required, especially since treatment planning systems are able and do allow out-of-field doses. Proton therapy significantly reduces doses, such as to fetus, compared photon radiotherapy techniques could be promising for patients. Within this study Monte Carlo calculations performed on th...

The modelling with the Geant4 toolkit of moderated 3He-filled proportional neutron counters is studied. The energy deposition spectra by the neutron capture products in the gas counter is compared with experimental results. On the other hand, efficiency calculation for polyethylene moderated proportional counters are compared with experimental and MCNPX results.Finally, the application of the G...

Introduction: Because of importance of impact of the Source to Surface Distance (SSD) in determining of monitor unit for electron-therapy, it is essential to know the Virtual Source Position (VSP) for electron beam for a linear therapeutic accelerator for each energy and field size. , especially using the Khan method (photo distance squared method) And compare the results with...