Fast neutrons produced by irradiation of a thick beryllium target with 20–50 MeV deuterons are used for activation analysis.
The spatial neutron flux distribution around the target is measured. A rotating sample holder is used for the simultaneous
irradiation of samples and standards. Instrumental analysis can be applied for a number of elements. As an example, results
for calcium and strontium in some reference materials are given. The19F(n, 2n)18F reaction is used for the radiochemical determination of fluorine in rocks with a fluorine concentration ranging from 9 to