ISO/ASTM 51939:2017,Practice for blood irradiation dosimetry.The size of this pdf file is 4.08M.
ISO/ASTM 51939:2017 outlines the irradiator installation qualifi-cation program and the dosimetric procedures to be followed during operational qualification and performance qualification of the irradiator.
ISO/ASTM 51939:2017 covers dosimetry for the irradiation of blood product for self-contained irradiators (free-standing irradiators) utilizing radionuclides such as 137Cs and 60Co, or X-radiation (bremsstrahlung).
6. 2.3 Currently available low-energy X-ray irradiators generate X-radiation with a maximum energy of 160 keV.The spectrum of the X-ray energy extends from the maximum energy to approximately 30 keV.
6.2.4 The energy of the X-radiation influences the size and shape of the canister needed to achieve the desired level of dose uniformity in the blood canister. Filters are used to reduce the low-energy components to improve dose uniformity in the canister. These filters may form part of the X-ray tube or may be material added to the irradiator or canister. Reflectors may also be used to improve the dose uniformity.
6.2.5 The absorbed-dose rate and thus time of irradiation is determined by the tube current.