Table AT1. Example of corrections to natural gamma radiation (NGR) count data. (See table note.)
Depth in section (cm)
|
NGR (counts/s)
|
||
|---|---|---|---|
Median
|
Standard error
|
Correction
|
|
| 0 | 26.6 | 0.3 | –3.2 |
| 10 | 27.8 | 0.3 | –2.1 |
| 20 | 30.0 | 0.4 | 0.1 |
| 30 | 30.3 | 0.4 | 0.4 |
| 40 | 30.7 | 0.4 | 0.8 |
| 50 | 30.6 | 0.4 | 0.8 |
| 60 | 30.4 | 0.4 | 0.5 |
| 70 | 30.9 | 0.4 | 1.0 |
| 80 | 29.6 | 0.4 | –0.3 |
| 90 | 29.7 | 0.4 | –0.2 |
| 100 | 31.2 | 0.4 | 1.3 |
| 110 | 31.0 | 0.4 | 1.1 |
| 120 | 29.4 | 0.4 | –0.4 |
| 130 | 28.9 | 0.4 | –0.9 |
| 140 | 27.9 | 0.5 | –2.0 |
| 150* | 22.1 | 3.3 | –7.8 |
Note: * = the large apparent correction and the large standard error at 150 cm may be artifacts of core section length, with the sensor sometimes recording no sediment.