| U [V] | 1600 | 1500 | 1400 | 1300 | 1200 |
|---|---|---|---|---|---|
| d [cm] | cnt/min | cnt/min | cnt/min | cnt/min | cnt/min |
| (inf) background | 26479 | 18310 | 12753 | 8648 | 5384 |
| 50 | 27158 | 18992 | 13682 | 9125 | 5541 |
| 45 | 27400 | 19106 | 13634 | 9052 | 5432 |
| 40 | 27663 | 19270 | 13698 | 9592 | 5394 |
| 35 | 28372 | 19890 | 14135 | 9669 | 5745 |
| 30 | 28888 | 20183 | 14699 | 9826 | 5924 |
| 25 | 29657 | 21204 | 15289 | 10311 | 6279 |
| 20 | 31205 | 22366 | 16175 | 10980 | 6745 |
| 15 | 33854 | 24692 | 18481 | 12583 | 7432 |
| 10 | 39161 | 29096 | 22745 | 15772 | 9170 |
| 5 | 50611 | 40731 | 31425 | 22779 | 13055 |
| 1 | 79374 | 62149 | 50112 | 36137 | 22406 |