A study of gamma-ray and neutron radiation in the interaction of a 2 MeV proton beam with various materials.
Epithermal neutron source based on a tandem accelerator with vacuum insulation and lithium target has been proposed, developed and operated in Budker Institute of Nuclear Physics. The source is regarded as a prototype of a future compact device suitable for carrying out BNCT in oncology centers. In this work the measurements of gamma-ray and neutron radiation are presented for the interaction of a 2 MeV proton beam with various materials (Li, C, F, Al, V, Ti, Cu, Mo, stainless steel, and Ta). The obtained results enabled the optimization of the neutron-generating target and the high energy beam transportation path.
Current progress and future prospects of the VITA based neutron source.
At the BINP, a pilot accelerator based epithermal neutron source is now in use. Most recent investigations on the facility are related with studying the dark current, X-ray radiation measuring, optimization of H(-)-beam injection and new gas stripping target calibrating. The results of these studies, ways of providing stability to the accelerator are presented and discussed, as well as the ways of creating the therapeutic beam and strategies of applying the facility for clinical use.
The onset of radiation blistering as a function of target temperature for D+ irradiated copper
Radiation blistering in 200 keV D+ irradiated copper has been studied for target temperatures in the range 120 to 380 K. Abrupt changes in both the critical dose for blistering and the blister morphology are observed to occur at target temperatures of 195 ± 10 and 300 ± 5 K. For target temperatures in the ranges 120 to 190 K and 300 to 380 K, semi-spherical blisters with a mean diameter of ~5.5 μm are observed to form at fluences of (2.0 ± 0.5) × 1022 and (4 ± 1) × 1022 d/m2, respectively. In the intermediate temperature region, irregularly shaped blisters with a mean diameter of ~1.3 μm are found to form at a fluence of (6 ± 2) × 1021 d/m2. Depth profiles of the implanted deuterium have been obtained. The deuterium concentrations at the onset of blistering are found to be approximately constant over the temperature ranges 120 to 190 K and 190 to 300 K, although a different concentration is observed in each range. For temperatures above 300 K, the deuterium concentration at the onset of blistering is found to decrease with increasing temperature.