Re: [fluka-discuss]: ICRP 119_kerma in free air estimation

From: Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch>
Date: Tue, 11 Dec 2018 21:36:36 +0000

Dear Riya Dey,

changing the electron cut-off outside the target ragion will affect the energy deposited in the target:
with the lower cut secondary electrons generated outside the target can reach the target and deposit their energy in the target, thus giving a higher value for the energy deposited in the target.

Not sure what is the exact procedure to evaluate the kerma coefficients, but I think that the first approach is closer to its definition.

Moreover, I ran you inputs and I found different values than yours: 4.49 and 7.62 pGy/cm-2 (with few percent error) for the first and second input, respectively.
Probably you need more statistics.

Best luigi


On 10 Dec 2018, at 08:58, riya dey <riyadey_at_barc.gov.in<mailto:riyadey_at_barc.gov.in>> wrote:

Dear FLUKA experts,
Regarding my earlier doubt about Kerma in free air calculation, ICRP 119 referred values are attached here. I have calculated this value for 1.0 MeV.

In 1st input (1_WHOLE) electron cut-off value is set as 0.99 MeV and it is applied to all regions i.e. from void to target region. The calculated kerma value 4.12 pGy-cm^2 which is close to literature value 4.47 pGy-cm^2.

In 2nd (2_TARGET) input electron cut-off value is set as 0.99 MeV and it is applied to target region only i.e. the region where we want to calculate kerma. The calculated kerma value 11.28 pGy-cm^2 which is far from literature value.


In this respect what is the proper methodology to calculate kerma ? Do we need to stop electron transport in all region to calculate kerma and why ?

<kerma_free_air_ICRP_119.PNG><1_whole.inp><2_target.inp><extsource.f>



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Received on Wed Dec 12 2018 - 00:08:56 CET

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