| 摘要 |
<p>A method and apparatus are described for reducing the "dead-time" of a Geiger-Müller tube to about 5 or 6 microseconds in which the initial fall in anode voltage of the tube caused by a gamma-ray photon penetrating its wall and ionising the gas in the tube is amplified and the amplified signal used to switch the anode voltage to a lower value, thereby inhibiting further ionisation of the gas in the Geiger-Müller tube. After a short period of time in the range 3 to 10 microseconds, preferably 5 to 6 microseconds, the anode voltage is switched back to the original relatively higher voltage.</p> |
