Highly sensitive Europium doped SrSO4 OSL nanophosphor for radiation dosimetry applications

• Highly sensitive Eu doped SrSO4 OSL nano phosphor is developed.
• The OSL sensitivity is 1.26 times to that of the commercial Al2O3:C.
• Sub linear dose response with the saturation around 100 mGy is observed.
• The calculated MDD on the used set up is found to be 1.42 μGy.
• Practically no fading is observed for first ten days.

Highly sensitive Europium doped SrSO4 optically stimulated luminescent (OSL) phosphor was developed by synthesizing a nano phosphor which is treated at 1000 °C. Excellent OSL properties are observed in the developed phosphor and the sensitivity is found to be 1.26 times to that of the commercial Al2O3:C (Landauer Inc.) phosphor based on area integration method. The sample showed a single TL glow peak around 230 °C which is found to reduce by 47% after the OSL readout. Sublinear dose response with the saturation around 100 mGy is observed in this sample which suggests that it is extremely sensitive and hence will be suitable in detecting very low dose levels. Minimum measurable dose on the used set up is estimated to be 1.42 μGy. Practically no fading is observed for first ten days and the phosphor has excellent reusability. High sensitivity, low fading, excellent reusability will make this phosphor suitable for radiation dosimetry applications using OSL.

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