Re: Delta-ray production threshold

Jean-Emmanuel,
 
I think the reason is lack of counting statistic in cell culture region
because its volume less about 10 times than cover slip and water volumes.
So ranging from 0.18 cGy to 0.2 cGy is statistic fluctuation.
 
Best regards,
 
Oleg

Thu, 13 Sep 2012 17:40:31 +0200 от Jean-Emmanuel Groetz <jegroetz_at_univ-fcomte.fr>:
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>Users and experts,
>
>With FLUKA, I have calculated the dose deposited by iron ions at 1 GeV
>and secondaries (electrons, photons, protons...) in a cell culture with
>1 micron thick (between a cover slip and water).
>I used the HADROTHErapy option, with a transport cutoff at 1 keV for all
>particles and 150 eV for electrons (as Alfredo Ferrari suggested in a
>paper PMB 56 - 2011).
>When I modified the delta-ray production threshold (only in the cell
>culture) from 1 keV to 10 and 100 keV, the dose deposited by heavy ions
>increased and the dose from electrons decreased, as expected. But if I
>consider the total dose in the cell culture, it is not constant, ranging
>from 0.18 cGy to 0.2 cGy (the experimental dose was about 0.2 cGy).
>Total doses in cover slip (1 mm thick) and in water (1.9 cm) remain
>constant.
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>I am wondering what could be the reason of such results in the cell
>culture.
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>Thank you in advance for your help and suggestions.
>
>Jean-Emmanuel
>--
>_______________________________________________
>Jean-Emmanuel Groetz
>Laboratoire Chrono-Environnement UMR CNRS 6249
>Chimie-Physique & Rayonnements
>Universitц╘ de Franche-Comtц╘
>16 route de Gray
>25030 Besanц╖on Cedex
>France
>
>mailto : jegroetz_at_univ-fcomte.fr
>tel : +33 (0) 3 81 66 65 07
>fax : +33 (0) 3 81 66 65 22
>_______________________________________________
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Received on Tue Sep 25 2012 - 10:20:06 CEST