Operational and Dosimetric Parameters of a 1.5 MeV electron beam irradiator in static and dynamic irradiation modes
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2024
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INTERNATIONAL SYMPOSIA ON RADIATION PHYSICS, 19th
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Electron beam (EB) accelerators have been increasingly used in radiation processing applications. Most
aim to achieve reproducible chemical and biological effects on the irradiated material to preserve or
modify its characteristics with tight control of the absorbed dose (10-100 kGy). Accurate dosimetry, mainly
carried out with standard reference alanine dosimeters and cellulose triacetate (CTA) films, is essential to ensure
the reliability of the whole process [1]. However, variations in the electron energy, beam profiles, attainable dose
rate, and conveyor speed also affect the dose absorbed in the irradiated product, requiring constant control and
monitoring of these parameters. This task is accomplished with passive dosimeters in static irradiation mode
following the international standard recommendations. To broaden the quality control of the irradiation process, it
has been proposed to investigate the feasibility of using a homemade diode-based dosimetry system to measure the
electron beam profiles and monitor variations in the radiation field in an industrial EB accelerator (DC
1500/25/04JOB188) [2]. This innovative system, when implemented, can provide real-time data, enabling
immediate action and avoiding unexpected shutdowns, thereby enhancing the efficiency of the process.
The dosimetry probe comprises a commercial diode (230 µm thick; 7.0 mm2
area), with the p+ front pad
connected to the Keithley 6517B electrometer in the short-circuit mode. In dynamic mode, irradiations
are carried out by sending the probe through the radiation field in the conveyor direction, varying speeds
from 2 to 10 m/min. For reference, static measurements are also gathered with alanine pellets and
cellulose triacetate (CTA) films. Regardless of the irradiation modes and the dosimeter types, the beam
profiles and dose measurements are in good agreement, as shown in Fig.1. The data reproducibility
remains to be investigated.
Como referenciar
GONÇALVES, J.A.C.; ASFORA, V.K.; KHOURY, H.J.; BUENO, C.C. Operational and Dosimetric Parameters of a 1.5 MeV electron beam irradiator in static and dynamic irradiation modes. In: PESSANHA, SOFIA (ed.); MANSO, MARTA (ed.). In: INTERNATIONAL SYMPOSIA ON RADIATION PHYSICS, 19th, September 1-5, 2024, Lisbon, Portugal. Abstract... Lisbon, Portugal: Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologia, 2024. p. 160-160. Disponível em: https://repositorio.ipen.br/handle/123456789/48970. Acesso em: 09 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.