Dental radiography: tooth enamel EPR dose assessment from Rando phantom measurements

被引：18

作者：

Aragno, D ^{[1
]}

Fattibene, P ^{[1
]}

Onori, S ^{[1
]}

机构：

[1] Ist Super Sanita, I-00161 Rome, Italy

来源：

PHYSICS IN MEDICINE AND BIOLOGY | 2000年 / 45卷 / 09期

关键词：

D O I：

10.1088/0031-9155/45/9/317

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

Electron paramagnetic resonance dosimetry of tooth enamel is now established as a suitable method for individual dose reconstruction following radiation accidents. The accuracy of the method is limited by some confounding factors, among which is the dose received due to medical x-ray irradiation. In the present paper the EPR response of tooth enamel to endoral examination was experimentally evaluated using an anthropomorphic phantom. The dose to enamel for a single exposure of a typical dental examination performed with a new x-ray generation unit working at 65 kVp gave rise to a CO2- signal of intensity similar to that induced by a dose of about 2 mGy of Co-60. EPR measurements were performed on the entire tooth with no attempt to separate buccal and lingual components. Also the dose to enamel for an orthopantomography exam was estimated. It was derived from TLD measurements as equivalent to 0.2 mGy of Co-60. In view of application to risk assessment analysis, in the present work the value for the ratio of the reference dose at the phantom surface measured with TLD to the dose at the tooth measured with EPR was determined.

引用

页码：2671 / 2683

页数：13

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