Radio-thermoluminescence is the property of a crystal to emit light when heated when the crystal has previously been exposed to ionizing radiationAny radiation which directly or indirectly ionizes, e.g. alp.... In wide areas, the emitted amount of light is proportional to the irradiated doseMeasure of a radiation effect to be indicated more precisely.... For instance, the radio-thermoluminescence effect of calcium or lithium fluoride is used to determine the doseMeasure of a radiation effect to be indicated more precisely....