Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

ESR SPECTROSCOPY OF ALANINE IMPACTED BY HIGH ENERGY IRRADIATIONS FOR WIDE RANGE DOSIMETRY
Tomas Čeponis^a, Eugenijus Gaubas^a, Jonas Venius^b, Aleksandras Cicinas^b, Freddy Callens^c, Jevgenij Kusakovskij^c, Henk Vrielinck^c, Kenichiro Mizohata^d, Jyrki Raisanen^d, and Pertti Tikkanen^d
^aVilnius University Institute of Applied Research, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: tomas.ceponis@ff.vu.lt
^bNational Cancer Institute, Santariškių 1, LT-08660 Vilnius
^cDepartment of Solid State Sciences, Ghent University, Krijgslaan 281 – S1, B-9000 Ghent, Belgium
^dDepartment of Physics, Helsinki University, Pietari Kalmin katu 2, FI-00014 Helsinki, Finland

Received 26 June 2015; revised 20 July 2015; accepted 29 September 2015

The ESR spectrometry, based on alanine dosimeters, is a standard tool for dosimetry of different type ionizing radiations. The calibrated dosimeters and ESR readers operate rather reliably in the dose range up to 200 kGy. In this study, the ESR spectrometry of stable free radicals in alanine, induced by penetrative X- and γ-rays as well as neutron and stopped proton irradiations covering the dose range from a few Gy to a few MGy, has been performed in order to create the generalized calibration function for the wide range dosimetry. The simulations based on the cumulative generation of ESR active stable radicals R1, R2 and R3 enabled us to derive the generalized calibration model ascribed to the irradiation fluence from 10¹⁰ to 2 × 10¹⁶ particle/cm² normalized using 1 MeV neutron equivalent.

Keywords: ESR spectroscopy, dosimetry, alanine
PACS: 76.30.-v, 87.53.Bn, 87.55.N-

AUKŠTŲJŲ ENERGIJŲ SPINDULIUOTĖMIS APŠVITINTO ALANINO ESR SPEKTROSKOPIJA PLATAUS DIAPAZONO DOZIMETRIJAI

Tomas Čeponis^a, Eugenijus Gaubas^a, Jonas Venius^b, Aleksandras Cicinas^b, Freddy Callens^c, Jevgenij Kusakovskij^c, Henk Vrielinck^c, Kenichiro Mizohata^d, Jyrki Raisanen^d, Pertti Tikkanen^d
^aVilniaus universiteto Taikomųjų mokslų institutas, Vilnius, Lietuva
^bNacionalinis vėžio institutas, Vilnius, Lietuva
^cGento universitetas, Gentas, Belgija

^dHelsinkio universitetas, Helsinkis, Suomija

Aukštųjų energijų fizikos eksperimentinės įrangos ir dalelių greitintuvų aplinkos stebėsenai, branduolinių reaktorių aplinkos bei branduolinio kuro atliekų monitoringui, medicininėje diagnostikoje ir terapijoje labai svarbu registruoti jonizuojančiųjų spinduliuočių sukauptą foninę dozę, siekiant užtikrinti toje aplinkoje veikiančios elektroninės įrangos funkcionalumą, numatyti jos degradacijos trukmę ir įvertinti personalo radiacinę saugą. Minėtiems taikymams būtinas apšvitos dozės įvertinimas ir apšvitos dozės sąsajos su šaltinių spinduliuočių integriniu srautu – apšvitos įtėkiu, sukuriamu įvairaus tipo spinduliuočių. Šiame darbe buvo ištirtos elektronų sukinių rezonansų (ESR) spektro smailių alanine amplitudės priklausomybės nuo apšvitos dozės (plačiame, 0,5 Gy – 1 MGy intervale) paveikus įvairiomis spinduliuotėmis (60 ir 6 MeV Rentgeno, 355 keV gama, 23 MeV spalatoriaus neutronais, 8 MeV protonais). Ši dozinė ESR signalų alanine priklausomybė buvo susieta su įtėkių skale, kalibruota 1 MeV energijos neutronų ekvivalentinėms pažeidoms. Sukurti fenomenologiniai modeliai kalibracinių įtėkių ir dozių sąsajos funkcijoms aproksimuoti.

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