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McMaster University: Instrumental Neutron Activation Analysis (INAA), low detection limits



Instrumental neutron activation analysis of 33 trace elements was performed on the till fractions. These analyses were done on a 3-monitor reactor in laboratories at McMaster University.

General Methodology:

The till fractions (< 63 μm) were capped in 7 ml plastic containers. The samples (weight = 5 ± 2 g) were irradiated at McMaster University's 3 monitor reactor.  A batch irradiation consisted of 21 samples and the delay between irradiation and counting was 5 to 8 days.  A single 1 hour count (3600 s) was performed on each sample by a germanium detector (EGEG-Ortec). The proposed detection limit was calculated at the 3σ level.  Measurement error is: ± detection limit + 5% of the measured value. The analytical results are presented in Appendix 2A for the following trace elements [Ag, As, Au, Mo, Sb, Se, Th, U, W, rare-earths (Ce, Eu, Ho, La, Lu, Nd, Sm, Tb, Yb)] and in Appendix 2B for the others (Br, Cs, Hf, Sc, Ta, Ca, Na, Fe, Ba, Co, Cr, Ni, Ir, Rb, Zr).

[description taken from GSC Open File 3269, p.12]

Instrument:

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  3464     Ag_INA  5
2  3465     As_INA  0.5
3  3466     Au_INA  4
4  3467     Ba_INA  2
5  3468     Br_INA  0.5
6  3469     Ca_INA  1
7  3470     Ce_INA  2
8  3471     Co_INA  2
9  3472     Cr_INA  10
10  10  3473     Cs_INA  1
11  11  3474     Eu_INA  0.2
12  12  3475     Fe_INA  0.1
13  13  3476     Hf_INA  0.2
14  14  3477     Ho_INA  0.5
15  15  3478     Ir_INA  50
16  16  3479     La_INA  0.5
17  17  3480     Lu_INA  0.05
18  18  3481     Mo_INA  2
19  19  3482     Na_INA  0.02
20  20  3483     Nd_INA  5
21  21  3484     Ni_INA  100
22  22  3485     Rb_INA  10
23  23  3486     Sb_INA  0.1
24  24  3487     Sc_INA  0.2
25  25  3488     Se_INA  5
26  26  3489     Sm_INA  0.1
27  27  3490     Ta_INA  1
28  28  3491     Tb_INA  0.2
29  29  3492     Th_INA  0.2
30  30  3493     U_INA  0.5
31  31  3494     W_INA  1
32  32  3495     Yb_INA  0.2
33  33  3496     Zr_INA  200

Associated Analytical Packages:

IndexPackage IDPackage Name
1  83     McMaster University INAA (33 elements)
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