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The protom flux

by nykon
Tags: flux
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nykon
#1
Feb14-12, 02:44 AM
P: 7
Dear forum users,

I have a quite simple question. I have got a flux of protons measured in 1/(cm^2 s sr), I would like to have it in 1/(cm^2 s).

Best regards,
nykon
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zhermes
#2
Feb16-12, 03:00 PM
P: 1,261
Then you should multiple by the number of sr
nykon
#3
Feb17-12, 08:12 AM
P: 7
Quote Quote by zhermes View Post
Then you should multiple by the number of sr
Yes, I have got problem with sr concept:p Lets say that the distance between source and the detector is 1m. My detector has effective area of 1 cm^2. So by how many sr I should multiply my flux?

My answer would be:

The area of the sphere with radius of 1m^2 is:

[itex]S = 40000 \pi [cm^2][/itex]

the effectiv area of the detector is D = 1cm^2, so:

[itex]\frac{D}{S} = \frac{1}{40 000 \pi} = \frac{1}{125600} = 7.9 \times 10^{-6} [/itex]

So the soild angle of my detector should be:

[itex]θ_{D} = 4\pi \times 7.9 \times 10^{-6}[sr][/itex]

So finally:

[itex]θ_{D} = 9.92 \times 10^{-5} [sr][/itex]

Am I right?

Best regards,
nykon

zhermes
#4
Feb17-12, 10:06 AM
P: 1,261
The protom flux

Yeah, I think that looks great!


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