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Anyone know what the average neutron background neutron flux is?

Hugo Drax said:
How man counts per hour to expect when using a he3 moderated neutron detector?
Click to expand...

According to the 1966 UNSCEAR report, you should be expecting around 1e-2 cm-2 s-1 at sea level. High elevations or deep locations may differ.

Edit: I didn't think that He3's scattering cross section led to any meaningful moderation, and that it only had a meaningful absorption cross section in the thermal range - so you may find that the detector efficiency for cosmic background isn't that high.
 
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Mark R said:
According to the 1966 UNSCEAR report, you should be expecting around 1e-2 cm-2 s-1 at sea level. High elevations or deep locations may differ.

Edit: I didn't think that He3's scattering cross section led to any meaningful moderation, and that it only had a meaningful absorption cross section in the thermal range - so you may find that the detector efficiency for cosmic background isn't that high.
Click to expand...

I am using materials to slow down to thermal range.
 
BTW Cats are decent neutron moderators.

You can put the HE3 probe underneath a basket full of cats and you get improved detection efficiency.
 
water or hdpe? you need a lot of moderation to detect something up to 10^20 eV

we have about 4 inches of hdpe on our detectors and have neutrons on the order of 10^6 eV
 
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