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Inorganic (ceramic) phosphors show distinct luminescence emission features upon infrared or ultraviolet excitation which in some cases depend on the history of the material. In particular, we observed the temporal luminescence behaviour of sodium yttrium fluoride (NaYF 4 ) to change upon exposure to accelerated electrons. Hence, the material can be used as an optical dosimetry material for high-energy radiation. In this contribution we summarize our investigations of the optical property changes induced by electron beam treatment and present new data concerning the stability of the optical interrogation process. As a result, we find a broad dose range (0 to 150 kGy) to be addressable with NaYF 4 . The highest dose sensitivity occurs between 0 and 50 kGy which makes the material a promising candidate for optical dosimetry below 5 kGy, a dose range addressed so far only with more complex non-optical systems. Its high stability under ambient conditions further corroborates a potential application of the material for industrial dosimetry.

Optical electron beam dosimetry with ceramic phosphors as passive sensor material for broad dose ranges