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.