Rodzi Mohd, Zhumadilov Kassym, Ohtaki Megu, Ivannikov Alexander, Bhattacharjee Deborshi, Fukumura Akifumi, Hoshi Masaharu
Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami Ku., Hiroshima, 734-8553, Japan.
Radiat Environ Biophys. 2011 Aug;50(3):451-8. doi: 10.1007/s00411-011-0358-9. Epub 2011 Mar 15.
Background radiation dose is used in dosimetry for estimating occupational doses of radiation workers or determining radiation dose of an individual following accidental exposure. In the present study, the absorbed dose and the background radiation level are determined using the electron spin resonance (ESR) method on tooth samples. The effect of using different tooth surfaces and teeth exposed with single medical X-rays on the absorbed dose are also evaluated. A total of 48 molars of position 6-8 were collected from 13 district hospitals in Peninsular Malaysia. Thirty-six teeth had not been exposed to any excessive radiation, and 12 teeth had been directly exposed to a single X-ray dose during medical treatment prior to extraction. There was no significant effect of tooth surfaces and exposure with single X-rays on the measured absorbed dose of an individual. The mean measured absorbed dose of the population is 34 ± 6.2 mGy, with an average tooth enamel age of 39 years. From the slope of a regression line, the estimated annual background dose for Peninsular Malaysia is 0.6 ± 0.3 mGy y(-1). This value is slightly lower than the yearly background dose for Malaysia, and the radiation background dose is established by ESR tooth measurements on samples from India and Russia.
本底辐射剂量用于剂量测定，以估算辐射工作人员的职业剂量或确定个体在意外照射后的辐射剂量。在本研究中，使用电子自旋共振（ESR）方法对牙齿样本进行吸收剂量和本底辐射水平的测定。还评估了使用不同牙齿表面以及单次医用X射线照射的牙齿对吸收剂量的影响。从马来西亚半岛的13家地区医院收集了总共48颗6-8位的磨牙。36颗牙齿未受到任何过量辐射，12颗牙齿在拔牙前的医疗过程中直接接受了单次X射线照射。牙齿表面和单次X射线照射对个体测量的吸收剂量没有显著影响。人群测量的平均吸收剂量为34±6.2 mGy，牙齿釉质平均年龄为39岁。根据回归线的斜率，马来西亚半岛的估计年本底剂量为0.6±0.3 mGy y(-1)。该值略低于马来西亚的年本底剂量，且该辐射本底剂量是通过对来自印度和俄罗斯样本的ESR牙齿测量确定的。
