Design, spectrum measurements and simulations for a 238Pu alpha-particle irradiator for bystander effect and genomic instability experiments. |
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Authors: | Arvi Hakanen Teemu Siiskonen Roy P?ll?nen Antti Kosunen Asko Turunen Oleg Belyakov |
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Institution: | STUK-Radiation and Nuclear Safety Authority P. O. Box 14, FIN-00881 Helsinki, Finland. arvi.hakanen@stuk.fi |
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Abstract: | Design, spectrum measurements and simulations for an alpha-particle irradiator for bystander effect and genomic instability experiments are presented. Measured alpha-particle energy spectra were used to confirm the characteristics of the source of the irradiator specified by the manufacturer of the source. The spectra were measured in vacuum with a high-resolution spectrometer and simulated with an AASI Monte Carlo code. As a next step, we simulated alpha-particle energy spectra at the target plane of the irradiator for three different source-to-target distances. In these simulations, helium was used as the medium between the source and the exit window of the irradiator; its pressure and temperature corresponded to those of the ambient air. Mean energies and full-widths at half-maximum (FWHM) were calculated for the three different helium gas tracks. |
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