Posted by **julie** on Thursday, January 13, 2011 at 10:53am.

If a source is emitting particles at a rate of 15,000 particles per second, what is

the flux at 30 cm away from the source?

- engineering -
**drwls**, Thursday, January 13, 2011 at 11:25am
It depends upon the angular distribution of the emitted particles. If you are talking about radioactive decay, unless the nuclei are aligned (which is extremely unlikely) the emission will be isotropic, i.e, the same in all directionns.

The flux (emission per area) 30 cm away will then be

15,000 part/sec/(4*pi*R^2),

where R = 0.30 m

- engineering -
**h**, Friday, January 14, 2011 at 7:11pm
isnt the area of a circle Pi*R^2?

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