Distinguishing method of natural and artificial dose in the environmental radiation has been developed with using thermoluminescence dosimeters. A principle of new thermoluminescence dosimeter is to use a difference in the energy dependence of TL response for each phosphor. One of TL properties that a sensitivity ratio between two different kinds of TL phosphor is dependent on radiation energy is used. Error on the estimation of effective energy in environmental radiation is dependent on the

more »

... ue of estimated energy, accuracy of TL measurement, and a ratio between the effective atomic number of the two TL phosphor. Effective energy of natural back ground radia-