[fluka-discuss]: RE: unexpected trend in dose calculation

From: Stefan Roesler <Stefan.Roesler_at_cern.ch>
Date: Fri, 5 Feb 2016 10:48:02 +0000

Dear Roman

You average in x and y (in your USRBIN input) from -25cm to 25cm. Thus, the dose increase and a non-zero dose even around z=0. I suggest to change binning such that each bin is indeed representative of the dose at a certain depth in water.

Cheers
Stefan

From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Roman Savinov
Sent: 01 February 2016 05:13
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: unexpected trend in dose calculation


dear Fluka experts,



I am trying to calculate dose values at various depths in spherical hollow water shielded by aluminum layer subject to spherical GCR source:

[cid:image001.png_at_01D1600A.D4C31830]

here MatVoid inside and VOID outside are vacuum. GCR source sphere (not shown) is of 20 cm radius.

What I expected to get is an exponential decay of dose values starting from outer layers of the water sphere toward inner layers demonstrating shielding property of aluminum and water, something similar to figure 9 here:

http://www.sciencedirect.com/science/article/pii/S2214552414000674/pdfft?md5=fa5b5ee5f3679917a4686acc3af31fc7&pid=1-s2.0-S2214552414000674-main.pdf



But what I do get is completely opposite. Dose increases from outer layers inward reaching maximum inside the vacuum void:

[cid:image002.png_at_01D1600A.D4C31830]

What is the difference between figure 9 and what I am doing?

How do I obtain a trend as in the figure 9?



Thank you,



Roman




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Received on Fri Feb 05 2016 - 14:12:22 CET

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