Analytical Method Metadata

Quantity: Uranium
Units: ppm

Uranium was determined using a neutron activation method with delayed neutron counting.  A detailed description of the method is provided by Boulanger et al. (1975).  In brief, a 1 gram sample is weighed into a 7 dram polyethylene vial, capped and sealed.  The irradiation is provided by the Slowpoke reactor with an operating flux of 5x10** 11 neutrons/sq cm/sec.  The samples are pneumatically transferred from an automatic loader to the reactor, where each sample is irradiated for 20 seconds.  After irradiation, the sample is again transferred pneumatically to the counting facility where after a 10 second delay the sample is counted for 20 seconds with six helium detector tubes embedded in paraffin.  Following counting, the samples are automatically ejected into a shielded storage container.  Calibration is carried out twice a day as a minimum, using natural materials of known uranium concentration.


Boulanger, A., Evans, D.J.R. and Raby, B.F. (1975).  Uranium analysis by neutron activation delayed neutron counting. Proc. Of the 7th Annual Symp of Canadian Mineral Analysts, Thunder Bay, Ontario, Sept 22-23, 1975.

Determination Limit:0.5  ppm
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Analytical Grouping:U | - | -

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