For irradiation indicators EMA chooses RadTag, a Canadian company which works in full compliance with ISO 9001:2000 guidelines.
The RadTag Blood Irradiation Indicator is a unique product which not only provides visual confirmation that the minimum absorbed dose level has been attained, but it also offers visual confirmation that the maximum permissible absorbed dose level has not been exceeded, helping you to confirm visually that your process is meeting requirements.
The sensitive portion (central dot) of the indicator is initially white and converts to blue when exposed to ionizing radiation. The degree of color conversion depends on the absorbed dose and so color-match references are conveniently printed right on the label.