الفهرس | Only 14 pages are availabe for public view |
Abstract The latter half of the twentieth century has been witness to a variety of releases of radioactive materials from industrial facilities, military program activities, or to over exposure of persons due to the improper use and disposal of radiation sources. These events resulted in a broad range of ionizing radiation exposure to a considerable number of people. There have been about 400 radiation accidents registered in 1944–2000 worldwide leading to confirmed significant over exposure of 3000 persons, hence, in case of exposure of the public to radiation, one can use human calcified tissues such as teeth, hair or nails as radiation dosimeter. In many situations, the human teeth cannot be available, so few investigators were going to work with the dental tissues for animals. The most of their articles were directed in the chronology studies, it means that the enamel samples were exposed to a past radiation. The current study was going to study EPR spectra of camel teeth which is not existed in the region of most of EPR investigators (Europe – north of Asia – USA). The camel has 22 milk teeth and 32 permanent teeth. It is different to other ruminants in having two front teeth in the upper jaw. Camels also have a pair of canine in both the upper and lower jaws which are used to crush woody plants for food. So, the camel teeth are mostly similar to the human teeth. Nevertheless, no EPR studies with camel enamel teeth were done before. So the EPR study of camel can substitute the human teeth in many conditions. Tooth enamel samples from molar teeth of camel were prepared with combined procedures of mechanical and chemical treatments of teeth. The EPR dose responses of the tooth enamel samples were examined in comparison with that Summary of human. The EPR dose response was obtained of tooth enamel samples by irradiated them to gamma dose from 1Gy up to 100kGy. The dosimetric signal was found to be increased linearly with gamma dose for all studied tooth enamel samples up to about 14.7 kGy. Afterward, the proportionality of linearity started to be decreased. |