2019 Volume 45 Issue 1 Pages 44-47
The particle radiotherapy can form a fine dose distribution and it is possible to reduce unwanted exposure to normal tissue. On the other hand, slight deviation of the irradiation position reduces the dose to the affected area, and increase the dose to the normal tissues. In order to prevent such an accident, it is desired to perform the dose evaluation at a place closer to the affected part in the body. We are developing a dosimeter in which optically stimulated luminescence (OSL) materials are adhered at the tip of an optical fiber as a small dosimeter that can be inserted into the patient body. In the region of high energy transfer (LET), a quenching effect occurs in the small dosimeter that decrease the dosimeter response. The occurrence of the quenching effect depends on the ionization density in the OSL materials. It is conceivable that even if the irradiated LET are the same, different responses are given if the irradiated ions are different. In this paper, we investigated the response of the small dosimeter with neon ion irradiation.
