Method to determine actinide pollution in water

Induced nuclear reactions: processes – systems – and elements – Nuclear transmutation – By neutron bombardment

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25039004, G01N 23222

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active

050874071

ABSTRACT:
Apparatus and a method using solid state track recorder (SSTR) metrology are disclosed to accurately measure small amounts of actinide pollution in water. A relatively small sample cell contains a fluidic sample and carries a SSTR. Sample cell configuration allows use of the fluidic sample itself as an asymptotic fission source for the SSTR and allows simultaneous irradiation of a plurality of such sample cells in existing thermal neutron irradiators. The metrology process comprises 1) obtaining a plurality of fluidic samples to be tested in sample cells containing SSTRs, 2) irradiating the sample cells uniformly with a neutron fluence of selected energy for a predetermined time, 3) determining base line actinide concentration from observed track density radiation activity in the SSTRs by calculation, by inclusion of a standard solid actinide deposit on an SSTR in an irradiated batch, or by inclusion of standard fluidic samples of known actinide concentration in an irradiated sample batch, and 4) determining the actinide concentration above the base line concentration in the tested samples by analyzing the SSTRs in each sample cell by known track counting and computational methods.

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