ISO/ASTM 51539:2013,Guide for use of radiation-sensitive indicators.The size of this standard pdf is 2.44M.
ISO/ASTM 51539:2013 covers procedures for using radiation-sensitive indicators in radiation processing. These indicators may be labels, papers, inks or packaging materials which undergo a visual change when exposed to ionizing radiation.
The purpose for using indicators is to determine visually whether or not a product has been irradiated, rather than to measure different dose levels.
5. Selection of indicators
5.1 Indicators should be selected that are convenient to use,will remain attached to the product, and can withstand the stresses of the irradiation process.
5.2 Indicators should be selected that have a response threshold appropriate for the range of dose experienced by theproduct. The visual change should occur below the minimum dose required for the product. In cases of process interruption where product does not pass into the path of the primary radiation field and receives only some scattered radiation, the attached indicator should not show a visual change.
5.3 The indicators selected should also have a respon
threshold appropriate for the ranges of dose rate, radiationenergy and environmental conditions experienced by the prod-uct (D)
5.4 The suitability of such indicators (under the conditionsof use)， from the time of purchase until their use or expirationof their shelf life. shall be determined.

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