Development of a method of absorbed dose on-line monitoring at product processing by scanned electron beam

• Main Authors: Pomatsalyuk, R.I., Shevchenko, V.A., Tenishev, A.Eh., Titov, D.V., Uvarov, V.L., Zakharchenko, A.A.
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2016
• Series: Вопросы атомной науки и техники
• Subjects: Экспериментальные методы и обработка данных
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/115370

The conditions of the contact-free absorbed dose monitoring at industrial product processing by electron beam are investigated. The method is based on analysing the collected charge in a stack monitor (SМ) mounted downstream of irradiated object. Using computer simulation on the basis of a modified transport code PENELOPE-2008, it is shown that by placing a filter of low-energy electrons before SМ it is possible to obtain the one-to-one correlation dependence between the monitor charge and absorbed energy of radiation in the processed object. At a certain surface density of the filter, this dependence takes on the form similar to linear. The possibility to use an air gap between the object and SМ as such a filter has been demonstrated. For the conditions of radiation plant with an electron accelerator LU-10 of NSC KIPT, the optimum distance of the SM location has been established. For the practical range of the electron energy, beam scan width and surface density of the irradiated product, the constants of the «product absorbed energy-to- SМ charge » linear dependence have been determined. The capability to establish the average absorbed dose in the object moving trough the irradiation zone on the SM current is shown. The calculation data are in satisfactory agreement with the results of measurements.