Table 2. Results of the chemical analysis of the gas-phase samples from borehole NAD-GTB#1a
[ppm, parts per million;Monitor interval |
Depth |
SF6 |
CO2 |
|
14 C(pmc) |
14 C age(years) |
14 C age+/- (%) |
1 |
139.1 |
0.001 |
713.0 |
-14.18 |
69 |
3,000 |
1.0 |
2 |
142.2 |
0.000 |
660.0 |
-14.11 |
75 |
2,400 |
1.2 |
3 |
143.7 |
0.000 |
711.0 |
-14.17 |
72 |
2,800 |
1.8 |
4 |
145.2 |
0.001 |
925.0 |
-15.10 |
64 |
3,700 |
0.8 |
5 |
146.8 |
0.004 |
996.0 |
-15.46 |
67 |
3,300 |
1.0 |
6 |
148.3 |
0.058 |
976.0 |
-15.39 |
68 |
3,200 |
1.4 |
7 |
149.8 |
0.000 |
1075.0 |
-15.58 |
71 |
2,900 |
1.3 |
8 |
151.3 |
0.008 |
1079.0 |
-14.81 |
61 |
4,000 |
0.8 |
9 |
152.9 |
0.815 |
1175.0 |
-16.18 |
58 |
4,500 |
1.0 |
10 |
155.9 |
0.030 |
1067.0 |
-15.89 |
66 |
3,400 |
0.7 |