What are Bonner balls and how do they measure neutron energy?

[DragonPetter]

I can't seem to find a description online, other than that they're used for neutron energy measurements.

 

[Astronuc]

One would have better luck if one searches on "Bonner spheres".

Examples -

http://www.eurados.org/conrad/Bologna/08-10-07-Bedogni.pdf

http://www.centronic.co.uk/downloads/REM_Counter_General_Info.pdf

http://www.nbl.doe.gov/htm/EML_Legacy_Website/ProcMan/Sect3/3_6.pdf

APPLICATIONS OF BONNER SPHERE DETECTORS IN NEUTRON FIELD DOSIMETRY
http://lss.fnal.gov/archive/tm/TM-1209.pdf

http://en.wikipedia.org/wiki/Bonner_sphere

 

[DragonPetter]

Thanks!