Methods of formation and control of radiation fields of M-30 microtron

Abstract

articles on the formation of radiation (cid:28)elds and discusses their characteristics for nuclear physics installati-ons. It includes application of various methods of measuring the currents of charged particles, methods of detecting radiation (cid:28)elds using various recording media and changing the spatial distribution using (cid:29)attening (cid:28)lters. Attention is also paid to an alternative low-cost registration method using commercial window glass. For the (cid:16)Mikrotron M-30(cid:17) accelerator, parameters of the radiation (cid:28)elds were investigated on a metrological bench oriented along the electron beam at distances of 0(cid:21)400 cm from the M-30 beam output node. Dosimetric characteristics were determined using ionization chambers of the ROBOTRON dosimeter and a Faraday cylinder designed for diagnostics of electron beams with energies up to 30 MeV. In this work, to control the spatial uniformity of the radiation (cid:28)eld, we used a registration method based on glass plates; the degree of uniformity of the radiation (cid:28)eld was determined by a change in their optical characteristics, namely, the degree of darkening. For correctness of the obtained distributions, the radiation dose was limited to the region of linearity of glass darkening from the absorbed dose. The use of a radiation shaper ensured irradiation of samples with radiation of a uniform (cid:28)eld in the irradiation plane of 30%, which satis(cid:28)es the conditions of radiation tests for most objects. Analytical dependencies of the radiation dose on the distance to the output node M-30 were obtained using a Faraday cylinder. The combination of these dose dependencies of glass darkening, the spatial homogeneity of the (cid:28)elds, along with the dose dependence on the distance to the source node, made it possible to develop protocols for dosimetric tracking of the irradiation process for materials and devices for various purposes.