[PDF]    http://dx.doi.org/10.3952/lithjphys.48302

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 48, 275–285 (2008)

I. Cibulskaitė, D. Adlienė, and J. Laurikaitienė
Kaunas University of Technology, Studentų 50, LT-51368 Kaunas
E-mail: agnici@gmail.com

Received 21 February 2008; revised 25 July 2008; accepted 18 September 2008

The results of Monte Carlo modelling of the low energy X-ray photon interaction processes in Si detector coated by different materials of different thickness are presented in this paper. Detector constructions containing free standing polymer-like carbon coatings and diamond-like carbon (DLC) coatings deposited onto detector surface were investigated. Total and scatter doses in coated samples were calculated and the influence of the coating material, composition, and thickness on the X-ray photon scattering processes in Si detector was evaluated. Evaluation of the detector construction with protective coating corresponding to the lowest fraction of scattered photons as compared to the calculated total dose is discussed in the paper. It is shown that nanothick DLC coatings directly deposited onto detector surface are promising materials in the construction of radiation detectors due to their suitable mechanical properties, resistance against chemicals and against radiation damage of DLC films.
Keywords: scattered radiation, detectors, Monte Carlo method, DLC films
PACS: 02.70.Uu, 29.40.Wk, 32.80.Cy, 81.05.Uw, 81.40.Wx

I. Cibulskaitė, D. Adlienė, J. Laurikaitienė
Kauno technologijos universitetas, Kaunas, Lietuva

Pristatomi mažų energijų Rentgeno fotonų sąveikos su Si detektoriumi Monte Karlo modeliavimo rezultatai, leidžiantys įvertinti įvairių detektoriaus apsauginių dangų įtaką dozėms, registruojamoms detektoriuje. Tyrimui pasirinktos detektorių konstrukcijos su apsauginėmis polimerinio tipo anglies bei deimanto tipo anglies dangomis. Šiems detektoriams apskaičiuotos pilnoji bei sklaidos dozės, pagal kurias vertinta apsauginės dangos elementinės sudėties bei storio įtaka Rentgeno fotonų sklaidai Si detektoriuje. Aptariamas detektorių su apsaugine danga vertinimas pagal mažiausios išsklaidytų fotonų frakcijos, lyginant su pilnąja sugertąja doze, kriterijų. Parodyta, kad dėl išskirtinių mechaninių savybių, atsparumo cheminiam poveikiui bei radiaciniams pažeidimams deimanto tipo anglies dangos, tiesiogiai nusodintos ant detektoriaus paviršiaus, yra perspektyvios konstruojant fotonų detektorius.

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