RE: [fluka-discuss]: limits for scoring region

From: Kramer, Stephen L <skramer_at_bnl.gov>
Date: Thu, 4 Feb 2016 17:29:55 +0000

Dear Hamideh
Of course when you average from x= -20 to +20 you are seeing only the shadow of the beam stop.
When you expand to x=-40 to +40 you are no longer averaging only over the beam stop but also the radiation that misses the beam stop. You should do a 2-D plot to see the shadow of the stop, if the dose is too high outside the beam stop you'll see how much larger to make it to reduce the dose to acceptable levels.
Steve
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Hamideh Jalali [jalali.hb_at_gmail.com]
Sent: Wednesday, February 03, 2016 5:09 AM
To: fluka-discuss
Subject: [fluka-discuss]: limits for scoring region

Dear FLUKA Experts

In my problem a photon beam strikes a silicon target and then tungsten stop with transverse dimension of 20 cm2 around the beam. These targets have been located in a 800 cm long room.
I am going to have 1D projection plot of usrbin results for dose equivalent behind 5cm thick Pb downstream wall of room from floor(y=-100) to ceiling (y=200).

What is the criterion to define the limits over x and z? As you know these limits affect the result and can lead to overestimate or underestimate the dose equivalent.

For example if the limit of x= - 20 to x= 20 and z=800 to z=801 was selected, the plot shows a minimum value around y=0 but if the limit is from x=-40 to x=40 and z=800 to z=801, the plot shows a maximum point around y=0!

Which one is correct and how I can be sure of my shielding calculations?
Any help and recommendation would be greatly appreciated.

Best Regards
Hamideh


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Received on Thu Feb 04 2016 - 19:50:48 CET

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