Department of Radiation Biophysics, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.
J Radiat Res. 2009 Nov;50(6):559-65. doi: 10.1269/jrr.09044. Epub 2009 Oct 3.
Electron spin resonance (ESR) dosimetry of teeth is used extensively for dose estimation following exposure to radiation. The population inhabiting the northeast region of India is prone to different cancers of the head and neck, and their prevalence is several times the national average. The objective of this study was to determine the role of radiation in the causation of this high cancer incidence by performing ESR spectroscopic measurements of tooth samples collected from the general population living in and around the city of Silchar. Nineteen tooth samples were used, and the age of the patients was 13-60 years. The excess dose, determined by subtraction of the natural background dose from the dose absorbed by the enamel, was found to the extent of 123 +/- 43 mGy. However, the individual excess dose was found to be higher in subjects who consumed lime (5/6) than in non-lime-consuming subjects (2/13). It is not entirely clear if radiation is the cause of this excess cancer in this region of India. Therefore there is a need for wider studies including consideration of tobacco consumption as well as a larger number of samples for tooth enamel dosimetry.
牙齿的电子自旋共振（ESR）剂量测定广泛用于辐射暴露后的剂量估计。居住在印度东北部地区的人群易患头颈部的各种癌症，其发病率是全国平均水平的数倍。本研究的目的是通过对居住在西尔恰尔市及其周边地区的普通人群的牙齿样本进行 ESR 光谱测量，来确定辐射在导致这种高癌症发病率中的作用。使用了 19 个牙齿样本，患者年龄在 13-60 岁之间。通过从牙釉质吸收的剂量中减去天然背景剂量来确定过量剂量，结果发现为 123 +/- 43 mGy。然而，在食用石灰的受试者（5/6）中，个体过量剂量高于不食用石灰的受试者（2/13）。尚不清楚辐射是否是印度该地区这种过量癌症的原因。因此，需要进行更广泛的研究，包括考虑烟草消费以及更多的牙齿 enamel 剂量学样本。
