1. The Geiger counter registered a dangerous level of radioactivity.

2. The Geiger counter may not have been properly calibrated.

3. Just before each Geiger counter click we see a flash of light from the illuminated electron.

4. The Geiger counter showed the existence of radioactivity.

5. This is a Geiger counter for detecting radioactivity.

6. The metronomic pulse was a Geiger Counter with soul.

7. The Geiger counter registered a high concentration of radioactive particles.

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8. Still another geophysical device. That is Geiger counter, which detects the presence of radioactive substances.

9. German physicist who developed the Geiger counter ( 1882 - 1945 ).

10. This is one reason why the crackling sound of the geiger counter has become such a potent symbol of the dangers.

11. There are various ways of monitoring radiation, the best known being the Geiger counter.

12. Sea-anglers dot the foreshore, their rods like the jittery feelers of crayfish or the dials of a Geiger counter.