儿童牙釉质中自由基含量与照射剂量的关系

本文用电子自旋共振（ＥＳＲ）技术，对２５个儿童恒牙和３５个乳牙釉质样品中的自由基含量进行了测定，研究了牙釉质中自由基含量与辐射剂量的关系。在２５个儿童恒牙样品中，有１２个男性样品，１３个女性样品；在３５个乳牙样品中，有２０个男性样品，１５个女性样品。将恒牙和乳牙各分成４和５个剂量组，用＾６０Ｃｏγ射线照射各组样品，剂量率为０．４８Ｇｙ／ｍｉｎ，各组累积剂量分别为０．３０（只对乳牙）、０．５０、１．

RELATIONSHIP BETWEEN FREE RADICAL CONTENT IN CHILD TOOTH ENAMEL AND RADIATION DOSE

Free radical contents of the tooth enamel in 25 children permanent tooth and 35 milktooth samples were measured by electron spin resonance (ESR) technique, and the relationshipbetween free radical content of the tooth enamel and radiation dose was also investigated. Of the25 children tooth samples there are 13 male samples and 12 female samples respectively, 20 malesamples and 15 female samples. In 35 milk tooth samples permanent and milk tooth samples weredivided into 5 dose groups each, and irradiated with 60Co γ ray at dose rate of 0.48 Gy/min. Radi-ation doses of 5 groups were 0.30, 0.50, 1.00, 3.00 and 5.00 Gy, respectively. Results indicat-ed that there was no significant difference in background ESR signal intensity between male andfemale samples for both chirdren permanent teeth and milk teeth. And also no significant differ-ence in background ESR signal intensity between chirdren permanent teeth and milk teeth wasobserved. Free radical content of teeth enamel increased linearly with increasing of radiationdose. The results of the paper could be applied to dose estimation of exposed individual in thecase of radiation accident. Two methods of ESR dosimetry were also discussed.