Abstract
Optically stimulated luminescence (OSL) intensity versus dose response of indigenously developed LiMgPO4:Tb,B (LMP) disks is linear in the range of 1 mGy–1 kGy. Currently, no other synthetic OSL phosphor is available, which covers such a large dose range. In order to assess the feasibility of using the phosphor in low-dose food irradiation dosimetry (up to 1 kGy), dosimetric characterization of LMP-based OSL dosimeter was carried out under both, gamma and electron beam irradiation. The doses estimated by LMP and routine dosimeters match well in the field trials. Hence, this phosphor has the potential to be used in phytosanitary application using radiation, where delivered doses are of the order of 0.01–1 kGy. Practical applications Food irradiation dosimetry, in India, is being carried out using chemical dosimeters such as Fricke, Ceric-cerous sulphate, and Alanine-electron paramagnetic resonance. The former two are liquid dosimeters kept in glass tubes and therefore need to be handled delicately during irradiation. The complex chemical preparation, sensitive to environmental conditions (temperature, humidity, etc.) and temperature changes, sensitive to UV radiation and the high sensitivity to impurities make these dosimetry systems inconvenient for routine applications. The OSL intensity versus dose response of indigenously developed LiMgPO4:Tb,B (LMP) has been observed to be linear up to 1 kGy. Apart from good dosimetric qualities, other qualities of the dosimeter system are quick readout, ease of handling, automated readout mechanisms, and integrity in harsh environments. The above-discussed attributes make LMP-based OSL dosimeter a potential candidate to carry out dosimetry during phytosanitary application of radiation in low-dose range (0.01–1 kGy). This range includes irradiation of mangoes, onions, potatoes, etc.
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