The dose calculation accuracy of a commercial pencil beam IMRT planning system is evaluated by comparison with Monte Carlo calculations and measurements in an anthropomorphic phantom. The target volume is in the right lung and mediastinum and thus significant tissue inhomogeneities are present. The Monte Carlo code is an adaptation of the MCNP code and the measurements were made with TLD and fi...

Nghiên cứu này áp dụng phương pháp mô phỏng Monte Carlo Mã EGSnrc với hai mã là chuyên dụng, BEAMnrc được sử để chùm tia phát ra từ đầu máy gia tốc và DOSXYZnrc tính toán liều lượng tốc. Từ đó, đánh giá sự suy giảm của bức xạ qua các lớp vật liệu che chắn. Kết quả nghiên ban cho thấy giới hạn ở khu vực nhân viên (khu Kiểm soát) 0,11 mSv / tuần (5,5 năm) công cộng Không kiểm 0,022 (1,1 ).

Nuclear logging is one of most important logging services provided by many oil service companies. The main parameters of interest are formation porosity, bulk density, and natural radiation. Other services are also provided from using complex nuclear logging tools, such as formation lithology/mineralogy, etc. Some parameters can be measured by using neutron logging tools and some can only be me...

Background: The aim of this study was to develop and implement a Monte Carlo framework for evaluation of patient specific out-of-field organ equivalent dose (OED). Materials and Methods: Dose calculations were performed using a Monte Carlo-based model of Oncor linac and tomographic phantoms. Monte Carlo simulations were performed using EGSnrc user codes. Dose measurements were performed using r...

background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...