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4.1x00a0;Ionizing radiation produces physical or chemical changes in many materials that can be measured and related to absorbed dose. Materials with radiation-induced changes that have been thoroughly studied can be used as dosimeters in radiation processing.
4.2x00a0;Before a material can be considered for use as a dosimeter, certain characteristics related to manufacture and measurement of its response to ionizing radiation need to be considered, including:
4.2.1x00a0;the ability to manufacture batches of the material with evidence demonstrating a reproducible radiation-induced change,
4.2.2x00a0; the availability of instrumentation for measuring this change, and
4.2.3x00a0;the ability to take into account effects of influence quantities on the dosimeter response and on the measured absorbed-dose values.
4.3x00a0;Dosimeter/dosimetry system characterization is conducted to determine the performance characteristics for a dosimeter/dosimetry system related to its capability for measuring absorbed dose. The information obtained from dosimeter/dosimetry system characterization includes the reproducibility of the measured absorbed-dose value, the useful absorbed-dose range, effects of influence quantities, and the conditions under which the dosimeters can be calibrated and used effectively.
4.4x00a0; The influence quantities of importance might differ for different radiation processing applications and facilities. For references to standards describing different applications and facilities, see ISO/ASTM Practice 52628.
4.5x00a0;Classification of a dosimeter as a type I dosimeter or a type II dosimeter (see ISO/ASTM Practice 52628) is based on performance characteristics related to the effects of influence quantities obtained from dosimeter/dosimetry system characterization.
4.6x00a0; The dosimeter manufacturer or supplier is responsible for providing a product that meets the performance characteristics defined in product specifications, certificates of conformance, or similar types of documents. Dosimeter specifications should be developed based on dosimeter/dosimetry system characterization.
4.7x00a0;The user has the responsibility for ensuring that the dosimetry requirements for the specific applications are met and that dosimeter/dosimetry system characterization information has been considered in:
4.7.1x00a0;determining the suitability of the dosimeter or dosimetry system for the specific application (see ISO/ASTM Practice 52628),
4.7.2x00a0; selecting the calibration method (see ISO/ASTM Guide 51261),
4.7.3x00a0;establishing dosime
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