Analytical Suite Metadata

Becquerel (stream sediment) INAA (25 + Au) (NGR, BC reanalysis, 1990)



Becquerel (National Geochemical Reconnaissance), stream sediment; INAA (As, Au, Ba, Br, Ce, Co, Cr, Cs, Fe, Hf, La, Lu, Mo, Na, Ni, Rb, Sb, Sc, Sm, Ta, Tb, Th, U, W, Yb, Zr)

General Methodology:

Samples weighing 20 grams on average were epithermally irradiated for twenty minutes in a neutron flux of 1011 neutrons/cm2/sec.  After a decay period of approximately one week, gamma-ray emissions of the elements of interest were measured using a gamma-ray spectrometer with high resolution, coaxial germanium detector.  Counting time was approximately fifteen minutes per sample.  Counting data was compiled on a computer and later converted to concentrations.  Numerous international reference samples were irradiated within each analytical batch.

Concentrations below the reported detection limit were assigned a value equivalent to one-half of the detection limit.

Instrument: unstated

Sample material: solid

Sample weight: unstated


Analytical Technique:

Hierarchical classification

Technique >> Radiochemical methods >> Activation analysis >> Neutron activation >> INAA

Children

PGNAA | DGNAA


Analytical Decomposition:

Hierarchical classification

Decomposition >> None

Children

None


Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  2330     As_INA  0.5
2  2331     Au_INA  2
3  2332     Ba_INA  100
4  2333     Br_INA  0.5
5  2334     Ce_INA  10
6  2335     Co_INA  5
7  2336     Cr_INA  5
8  2337     Cs_INA  0.5
9  2338     Fe_INA  0.2
10  10  2339     Hf_INA  1
11  11  2340     La_INA  5
12  12  2341     Lu_INA  0.2
13  13  2342     Mo_INA  1
14  14  2343     Na_INA  0.1
15  15  2344     Ni_INA  10
16  16  2345     Rb_INA  5
17  17  2346     Sb_INA  0.1
18  18  2347     Sc_INA  0.5
19  19  2348     Sm_INA  0.5
20  20  2349     Ta_INA  0.5
21  21  2350     Tb_INA  0.5
22  22  2351     Th_INA  0.5
23  23  2352     U_INA  0.2
24  24  2354     W_INA  2
25  25  2355     Yb_INA  2
26  26  2356     Zr_INA  200
27  27  2357     Wt_INA  0.01

Associated Analytical Packages:

IndexPackage IDPackage Name
1  492     Becquerel (NGR stream sediment) INAA (25 + Au)
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