Monte Carlo-based calculation of imaging plate response to 90Sr in teeth: experimental validation of the required correction on sample thickness
Recently, a numerical method was proposed to correct the imaging plate (IP) response to 90Sr concentration in tooth samples, depending on the sample thickness. This is important to quantify any 90Sr concentration in teeth, which in turn is necessary to determine any 90Sr incorporation of a person retrospectively. Although the final goal will be to evaluate the (inhomogeneous) spatial distribution of 90Sr inside tooth samples precisely, the present study was restricted—as a first step—to the evaluation of 90Sr in teeth assuming a uniform 90Sr distribution. A numerical method proposed earlier was validated experimentally in the present study by measuring the IP response to standard sources of various thicknesses and 90Sr concentrations. For comparison, the energy deposition of the β-rays emitted by 90Sr in the IP—which is considered to be proportional to the IP luminescence signal—was calculated for the various sample thicknesses involved, by means of the MCNP-4C code. As a result, the measured IP response could be reproduced by the calculations within the uncertainties, depending on the thickness of the standard sources. Thus, the validity of the proposed numerical method to correct the IP response for sample thickness has successfully been demonstrated.
KeywordsElectron Spin Resonance Sample Thickness Modification Factor Imaging Plate 90Sr Concentration
Part of the present study was supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science under grant #15406002 and #17406001, awarded to Prof M. Hoshi, Hiroshima University. The authors express their sincere appreciation to Mr. Kazuhide Kitagawa, Mr. Shinji Suga, and Mr. Shingo Sasatani, Hiroshima University, for their support in the experiment using imaging plate, and to Mr. Takahisa Yamane of Fujifilm Co. Ltd for his support in the Monte Carlo calculations.
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