Nakamura N, Katanic J F, Miyazawa C
Department of Genetics, Radiation Effects Research Foundation, Hiroshima, Japan.
J Radiat Res. 1998 Sep;39(3):185-91. doi: 10.1269/jrr.39.185.
Electron spin resonance (ESR) measurement data of 98 teeth from atomic-bomb survivors who received various radiation doses were analyzed in terms of possible solar light exposure by tooth position. Each tooth was divided into buccal and lingual parts for independent ESR measurement. We found that average buccal doses were larger than their corresponding lingual doses by 0.48 +/- 0.30 Gy (first incisors), 0.33 +/- 0.38 Gy (second incisors), 0.20 +/- 0.23 Gy (canines), 0.24 +/- 0.26 Gy (first bicuspids), 0.17 +/- 0.51 Gy (second bicuspids) and 0.04 +/- 0.18 Gy (large molars and wisdom teeth). Such a clear declining trend following tooth position in the mouth is readily appreciated as due to solar light exposures. Comparisons of lingual doses of multiple teeth from the same five donors suggest that lingual doses of first incisors were also overestimated by 0.34 +/- 0.18 Gy. From the results presented, we deduce that the buccal doses of first incisors are, on the average, overestimated by nearly 0.8 Gy. Therefore, use of front teeth for biodosimetry requires special caution. How to estimate the contribution from exposure to solar light in ESR biodosimetry is discussed.
对接受不同辐射剂量的原子弹爆炸幸存者的98颗牙齿的电子自旋共振（ESR）测量数据，按照牙齿位置可能受到的太阳光照射情况进行了分析。每颗牙齿均分为颊侧和舌侧部分进行独立的ESR测量。我们发现，颊侧平均剂量比相应的舌侧剂量分别大0.48±0.30 Gy（第一颗门牙）、0.33±0.38 Gy（第二颗门牙）、0.20±0.23 Gy（犬齿）、0.24±0.26 Gy（第一前磨牙）、0.17±0.51 Gy（第二前磨牙）以及0.04±0.18 Gy（大磨牙和智齿）。口腔中牙齿位置呈现出如此明显的递减趋势，很容易理解为是由于太阳光照射所致。对来自相同五名捐赠者的多颗牙齿的舌侧剂量进行比较表明，第一颗门牙的舌侧剂量也被高估了0.34±0.18 Gy。根据所呈现的结果，我们推断第一颗门牙的颊侧剂量平均被高估了近0.8 Gy。因此，将前门牙用于生物剂量测定需要格外谨慎。本文讨论了如何在ESR生物剂量测定中估算太阳光照射的贡献。
