Date: Tue, 28 Jun 2016 06:22:10 +0000
Dear FLUKA experts,
I have a hemisphere of water shielded by a layer of aluminum subject to GCR:
[cid:fee5ca56-4ad5-40cc-a6d8-f9eca49065d9]
I'm measuring the rate of dose absorption by water for 10 shielding thicknesses: from 10 to 50 g/cm2.
I expect to see a decreasing trend with increasing thickness but what I'm getting instead is a trend which is somewhat level:
[cid:5bc0a7db-bb7c-4628-8951-a102cbf5571e]
While, the absorption rate of the shield increases with thickness:
[cid:735ab862-ae5a-442c-8220-276bf063c8b2]
Why doesn't water absorb less radiation as shielding layer getting thicker? Is it because 18.5 cm (50 g/cm2) of aluminum is as useless to shield from GCR as 3.7 cm (10 g/cm2)?
The inputs are as follows:
Source: GCR-IONF (protons - Carbon ions), GCR-SPE set to NO-NORM, the number of primary histories: 3e5
Target: hemisphere of water covered by layer of aluminum
Detector: USRBIN (by region, DOSE)
The conversion from USRBIN output to uGy/day is as follows:
[cid:a3be5f05-7db5-4b34-b34a-315d0467be7b]
where the second term is division by target's volume; [pr/s] is found by: Fluxst/flux (these two values are from the .out file)
I attached my input file
Any help would be greatly appreciated,
Roman
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- application/octet-stream attachment: GCR_sphr.inp
- application/vnd.openxmlformats-officedocument.spreadsheetml.sheet attachment: data.xlsx