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Hayes, R.B.* ; Haskell, E.H.* ; Wieser, A. ; Romanyukha, A.A.* ; Hardy, B.L.* ; Barrus, J.K.*

Assessment of an alanine EPR dosimetry technique with enhanced precision and accuracy.

Nucl. Instrum. Methods Phys. Res. Sect. A 440, 453-461 (2000)

Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

Abstract
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Dose reconstruction in the course of a series of blind tests demonstrated that an accuracy of 10 mGy for low doses and 1% for high doses can be achieved using EPR spectroscopy. This was accomplished using a combination of methodologies including polynomial filtration of the EPR spectrum, dosimeter rotation during scanning, use of an EPR standard fixed into the resonator and subtraction of all nonradiogenic signals. Doses were reconstructed over the range of 0.01-1000 Gy using this compound spectral EPR analysis. This EPR technique, being equally applicable to fractionated doses (such as those delivered during multiple radiotherapy treatments), was verified to exhibit dose reciprocity. Irradiated alanine dosimeters which were stored exhibited compound spectral EPR signal fading of ca 3 % over 9 months. All error estimates given in this paper are given at the 1 standard deviation level and unless otherwise specified do not account for uncertainties in source calibration.

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