Dose assurance service for low energy X-ray irradiators using an alanine-EPR transfer dosimetry system
Keywords:
dose control, SIT applications, self-shielded X-irradiators, solid state dosimetryAbstract
In recent years, X-ray irradiators have been introduced as an alternative to gamma irradiators due to the problems with the acquisition, transport and security of radioactive sources. Self-shielded low energy X-ray irradiators (such as the RS 2400) were developed to complement and eventually replace gamma sources. These irradiators are quite suitable for sterilizing insects for SIT applications, as well as for research on quarantine treatments of food and phytosanitary applications. During the irradiation of an agricultural product the absorbed dose inside the canister must be controlled to ensure that the desired effect is achieved without deleteriously affecting the product. The focus of this paper is to describe the Dose Assurance Service offered by the Insect Pest Control Laboratory of the Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture using an alanine-EPR dosimetry system as a transfer standard for low energy X-radiation. All the administrative and technical issues are now finalized and the dose assurance service is ready for operation. The purpose of this Service is to help facilities using such irradiators to check the quality of their dosimetry systems.
Resumen
En los últimos años, se han introducido los irradiadores de rayos X como una alternativa a los irradiadores gamma debido a los problemas con la adquisición, transporte y seguridad de las fuentes radiactivas. Los irradiadores de rayos X de baja energía auto blindado (como el RS 2400) fueron desarrollados para complementar y eventualmente sustituir las fuentes gamma. Estos irradiadores son muy adecuados para la esterilización de insectos para aplicaciones de TIE, así como para la investigación sobre tratamientos de cuarentena de los alimentos y las aplicaciones fitosanitarias. Durante la irradiación de un producto agrícola la dosis absorbida dentro del recipiente debe ser controlado para asegurar que el efecto deseado se consigue sin afectar perjudicialmente el producto. El objetivo de este trabajo es describir el Servicio de Aseguramiento de Dosis que ofrece el Laboratorio de Control de Plagas de Insectos del grupo de la FAO/OIEA de la División Técnica Nuclear en la Agricultura y la Alimentación mediante un sistema de dosimetría-alanina EPR como un estándar de transferencia de radiación X de baja energía. Todas los detalles administrativos y técnicos están finalizados y el servicio de garantía de dosis está listo para funcionar. La finalidad de este servicio es ayudar a las instalaciones que utilizan estos irradiadores para comprobar la calidad de sus sistemas de dosimetría.
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