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Table 2. Results of the chemical analysis of the gas-phase samples from borehole NAD-GTB#1a

[ppm, parts per million; , parts per thousand; pmc, percent modern carbon; %, percent]

Monitor interval

Depth
(meters)

SF6
(ppm)

CO2
(ppm)

13C
()
(standard is PDB)

14C
(pmc)

14C age
(years)

14C 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

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