Determination of fluorine in geological materials by fast neutron activation based on the 19F(n,2n)18F reaction |
| |
Authors: | M. Esprit C. Vandecasteele J. Hoste |
| |
Affiliation: | Institute for Nuclear, Rijksuniversiteit Gent, Proeftuinstraat 86, B-9000 Gent Belgium |
| |
Abstract: | The determination of fluorine in geological materials by fast neutron activation analysis based on the 19F(n, 2n)18F reaction is described. Fast neutrons are produced by irradiation of a thick beryllium target with 14.5 MeV deuerons. A rotating smple holder allows simultaneous irradiation of samples and standards. Fluorine-18 is separated by steam distillation of hexafluorosilicic acid or by extraction with triphenylatimony(V) dichloride and the annihilation radiation is measured with γ—γ coincidence equipment. The nuclear interference of recoil protons that induce the 18O(p,n)18F reaction is evaluated by means of synthetic samples: for a rock containing 43.4% of oxygen and 0.5% of hydrogen, the interference corresponds to 4.4 μg g?1 fluorine. The method was applied to USGS and NIMROC reference rocks: for concentrations between 6000 and 50 μg g?1, the relative standard deviation ranged from 2 to 10%. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|