Analytical Suite Metadata

Chemex (lake sediment) NADNC(U)-flux 8x1013, d.l.= 0.2ppm

Chemex, lake sediment; neutron activation-delayed neutron activity (uranium)-flux 8x1013

General Methodology:

Uranium was determined using a neutron activation method with delayed neutron counting.  With the exception of the irradiation facility, the method is very similar to that used by AECL in previous years, a detailed description of which is provided by Boulanger et al. (1975).  A two gram sample was irradiated for 10 seconds in the Triga reactor located at Washington State University.  The operating flux was 8 x 10** 13 neutrons/sq cm/sec.  After a 10 second delay, the sample was counted for 10 seconds.  The counting equipment was of AECL design.  Calibration was done twice a day or as required.  One standard was analysed after every 20 samples.


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.

Instrument: unstated

Sample material: solid

Sample weight: unstated

Analytical Technique:

Hierarchical classification

Technique >> Radiochemical methods >> Activation analysis >> Neutron activation >> Fission >> Delayed Neutron Counting



Analytical Decomposition:

Hierarchical classification

Decomposition >> None



Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  1078     U_NADNC  0.2

Associated Analytical Packages:

IndexPackage IDPackage Name
1  387     Chemex (NGR lake sediment, 1982 samples) AAS (8+4), CVAAS (Hg), LOI500, U, ISE(F)
2  390     Chemex (NGR stream sediment) AAS (8+3), cold vapour (Hg), COL(W), NADNC(U)
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