ISO/ASTM 51818:2013,Practice for dosimetry in an electron beam facility for radiation processing at energies between 80 and 300 keV.
ISO/ASTM 51818:2013 covers dosimetric procedures to be followed in installation qualification, operational qualification and performance qualification (IQ, OQ, PQ), and routine processing at electron beam facilities to ensure that the product has been treated with an acceptable range of absorbed doses.
4. Significance and use
4. 1 A variety of irradiation processes uses low energy electron beam facilities to modify product characteristics.Dosimetry requirements, the number and frequency of measurements, and record keeping requirements will vary depending on the type and end use of the products being processed. Dosimetry is often used in conjunction with physical, chemical, or biological testing of the product, to help verify specific treatment parameters.
4.3 Critical process parameters must be controlled to obtain reproducible dose distribution in processed materials. The electron beam energy, beam current, beam width and process line speed (conveying speed) affect absorbed dose
4. 4 Before any electron beam facility can be routinely utilized. it must be validated to determine its effectiveness.This involves testing of the process equipment, calibrating the measuring instruments and the dosimetry system, and demonstrating the ability to consistently deliver the required dose within predetermined specifications.