The article describes the methodology of generating covariance matrices of evaluated nuclear reaction data, which takes into account theoretical model calculations as well as experimentally measured values.
COBISS.SI-ID: 25341479
After the coated CFC wall to ITER-Like Wall (Beryllium/Tungsten/Carbon) transition in 201011, confirmation of the neutron yield calibration will be ensured by direct measurements using a calibrated 252Cf neutron source deployed by the in-vessel remote handling boom and Mascot manipulator inside the JET vacuum vessel. The paper describes preliminary calculations and the results of numerical study of the effect of source holder on neutron detector response. The source baton was designed in such a way, that it does not significantly affect the neutron spectrum, angular neutron flux distribution or activation detector response. All effects are approximately equal to or less than 1%. The largest disturbance to the neutron flux angular distribution and to the neutron spectrum arises from the source capsule. Hence one should obtain as much information as possible about the capsule and the 252Cf source material in order to avoid additional systematic errors.
COBISS.SI-ID: 26263847
Evaluation of an older critical experiment, done at the Oak Ridge National Laboratory, USA, documented as a chapter in the book: ICSBEP / OECDNEA, Idaho Falls (2011). The number of documented critical experiments, in which the interaction of containers, filled with a fissile solution, is small. In the mentioned book, one of these experiments was treated, in which the fuel is a HEU solution of uranyl fluoride, filled into aluminum cylinders, which are positioned in a hexagonal array of varying pitch. The experiment is important for determining the critical mass for the storage and transport of highly enriched fissionable material, especially for the safe and efficient handling of large quantities of such material. By evaluating the experiment with the Monte Carlo method, we were able to reduce the total uncertainty in keff to less than one percent, which is a condition for the experiment to be adopted as a "benchmark".
COBISS.SI-ID: 25846567
Intensity-modulated radiation therapy (IMRT) is a conformal irradiation technique that enables steep dose gradients. In head and neck tumours this approach spares parotid-gland function without compromise to treatment efficacy. Anatomical and molecular imaging modalities may be used to tailor treatment by enabling proper selection and delineation of target volumes and organs at risk, which in turn lead to dose prescriptions that take into account the underlying tumour biology (eg, human papillomavirus status). Therefore, adaptations can be made throughout the course of radiotherapy, as required. Planned dose increases to parts of the target volumes may also be used to match the radiosensitivity of tumours (so-called dose-painting), assessed by molecular imaging. For swift implementation of tailored and adaptive IMRT, tools and procedures, such as accurate image acquisition and reconstruction, automatic segmentation of target volumes and organs at risk, non-rigid image and dose registration, and dose summation methods, need to be developed and properly validated
COBISS.SI-ID: 26679079
The first derivative probe method was tested in our linear magnetized discharge plasma device together with our Bulgarian partners. It has been shown that the method is very accurate also at elevated magnetic field values.
COBISS.SI-ID: 8998228