EPR dosimetry of tooth enamel: isolation of radiation-induced signal in the EPR spectrum of the enamel with the use of model with allowance for the relationship between shape of spectrum components and microwave power

«Radiation and Risk», 2009, vol. 18, no. 1, pp.88-98

Authors

Sanin D.B. - Researcher. Medical Radiological Research Center of the Russian Academy of Medical Sciences, Obninsk. Contacts: 4 Korolyov str., Obninsk, Kaluga region, Russia, 249036; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. .
Ivannikov A.I. - Senior Researcher. Medical Radiological Research Center of the Russian Academy of Medical Sciences, Obninsk.
Skvortsov V.G. - Head of laboratory. Medical Radiological Research Center of the Russian Academy of Medical Sciences, Obninsk.

Abstract

For the purpose of search of optimum algorithm of mathematical processing of the EPR spectra of irradiated tooth enamel the analysis of efficiency of usage of the analytical model considering change of the form a component of the EPR spectrum at various microwave power is made for definition of the absorbed dose on amplitude of the radiation-induced signal. EPR spectra irradiated with gamma rays in various doses of homogeneous samples of enamel (a mix of enamel from a several teeth), measured at various microwave power, have been processed with model use in which the parameters describing the form a component, established according to preliminary measured dependences on microwave power. Accuracy of mathematical processing estimated on a root-mean-square deviation of certain values of a dose from rating values. It is shown that use of the this model allows to increase accuracy of dose determination in comparison with earlier used model in which the form of the radiation-induced signal was fixed without power dependence, and the form native (background) signal varied in the course of model fitting to an experimental spectrum.

Key words
Retrospective dosimetry, tooth enamel, EPR-spectroscopy.

References

1. GOST R 22.3.04-96 Safety in emergency situations. Control of the population is dosimetric. Method for determining absorbed doses of external gamma radiation from the spectra of electron paramagnetic resonance of tooth enamel. Moscow: Gosstandart of Russia, 1996.

2. Ciesielski B., Schultka K., Wolakiewicz G. The effect of heating on background and radiation-induced EPR signals in tooth enamel. Spectrochimica Acta. 2006. Part A, Vol. 63. PP. 870-874.

3. Dubovsky S., Kirilov V. Reconstruction of individual absorbed doses by tooth enamel on the base of non-liner simulation of their EPR-spectra. Applied Radiation and Isotopes. 2001. Vol. 54. PP. 833-837.

4. Fattibene P., Argano D., Onori S. Thermal induced EPR signal in tooth enamel. Radiat. Meas. 2000. Vol. 32. PP. 393-398.

5. Hoshi M., Toyoda S., Ivannikov A. et al. Interlaboratory comparison of tooth enamel dosimetry on Semipalatinsk region: Part 1, general view. Radiat. Meas. 2007. Vol. 42. PP. 1005-1014.

6. IAEA Report. Use of electron paramagnetic resonance dosimetry with tooth enamel for retrospective dose assessment: report of coordinated research project. IAEA-TECDOC-1331. Vienna, 2002.

7. Ivannikov A., Toyoda S., Hoshi M. et al. Interlaboratory comparison of tooth enamel dosimetry on Semipalatinsk region. Part 2. Effects of spectrum processing. Radiat. Meas. 2007. Vol. 42. PP. 1015-1020.

8. Ivannikov A.I., Skvortsov V.G., Stepanenko V.F. et al. EPR tooth enamel dosimetry: optimization of the automated spectra deconvolution routine. Health Phys. 2001. Vol. 8. PP. 124-137.

9. Ivannikov A.I., Trompier D.F., Gaillard-Lecanu E. et al. Optimization of recording conditions for the EPR signal used in dental enamel dosimetry //Radiat. Prot. Dosim. 2002. Vol. 101. PP. 531-538.

10. Koshta A.A., Wieser A., Ignatiev E.A. et al. New computer procedure for routine EPR-dosimetry on tooth enamel: description and verification //Appl. Radiat. Isot. 2000. Vol. 52. PP. 1287-1290.

11. Sholom S.V., Chumak V.V. Decomposition of spectra in EPR dosimetry using the matrix method. Radiat. Meas. 2003. Vol. 37. PP. 365-370.

12. Skvortzov V.G., Ivannikov A.I., Eichhoff U. Assessment of individual accumulated irradiation doses using EPR spectroscopy of tooth enamel . J. Mol. Struc. 1995. Vol. 347. PP. 321-330.

13. Tielewuhan E., Ivannikov A., Zhumadilov K. et al. Spectra processing at tooth enamel dosimetry: Analyti-cal description of EPR spectrum at different microwave power. Radiat. Meas. 2006. Vol. 41. PP. 410-417.

14. Toyoda E., Tielewuhan A., Romanyukha A. et al. Comparison of three methods of numerical procedures for ESR dosimetry of human tooth enamel Appl. Radiat. Isot. 2005. Vol. 62, No. 2. PP. 181-185.

15. Wieser A., Debuyst R., Fattibene P. et al. The 3rd international intercomparison on EPR tooth dosimetry. Part 1. General analysis. Appl. Radiat. Isot. 2005. Vol. 62. PP. 163-171.

16. Wieser A., Debuyst R., Fattibene P. et al. The 3rd international intercomparison on EPR tooth dosimetry. Part 2. Final analysis. Radiat. Prot. Dosim. 2006. Vol. 120. PP. 176-183.

17. Zhumadilov K., Ivannikov A., Skvortsov V. et al. Tooth enamel EPR dosimetry: Optimization of EPR spec-tra recording parameters and effect of sample mass on spectral sensitivity. J. Radiat. Res. 2005. Vol. 46. PP. 435-442.

Full-text article (in Russian)