Interlaboratory comparison of EPR tooth enamel dosimetry with investigations of the dose responses of the standard samples

S. Toyoda, K. Inoue, I. Yamaguchi, M. Hoshi, S. Hirota, T. Oka, T. Shimazaki, H. Mizuno, A. Tani, H. Yasuda, C. A. B. Gonzales, K. Okutsu, A. Takahashi, N. Tanaka, A. Todaka

Seven Japanese laboratories participated in an intercomparison study to estimate the dose given to tooth enamel samples, using the electron spin resonance (ESR) method. Four of the participating laboratories each prepared a set of tooth enamel samples, consisting of 7 standard aliquots irradiated from 100 to 2000 mGy and three samples with an “unknown” dose between 140 to 960 mGy, which was intended to eliminate bias from sample preparation. Although not all seven laboratories measured all four sets of samples, the major finding was that systematic biases in estimating doses may be caused by differences in laboratory measurements rather than by the enamel extracting procedures. When doses were averaged by measurements made by multiple laboratories, the averaged values were close to the actual values. Scattering in the intercepts in the standard dose response would be a serious problem in actual dosimetry where no background sample is available.

Radiation Protection Dosimetry

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1557

1564

https://doi.org/10.1093/rpd/ncad150