Abstract
Photoluminescence (PL) and radioluminescence (RL) from Dy3+ and Nd3+ were observed in the fluoroperovskite host NaMgF3 at visible and near infrared wavelengths. In the case of NaMgF3:Dy3+, the emission lifetime is long enough to efficiently separate the PL emission from more prompt emissions, such as Čerenkov photons, by temporal means. This property is useful in certain fibre optic dosimeter applications involving pulsed high energy X-rays, such as radiotherapy dosimetry. Such applications are often complicated by a background of Čerenkov photons and an emphasis on emission in the infrared may also prove valuable in mitigating this problem. At doses above approximately 1 kGy, the dependence of RL intensity on absorbed dose was found to be largely free from the influence of radiation induced colour centres for the near infrared emissions exhibited by both the Dy3+ and Nd3+ dopant.
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