A Method of Recording Coincidences between Geiger Counters

Abstract

RECENTLY the recording of coincidences between Geiger counters has become of considerable interest, and several experimental arrangements have been described for this purpose.¹ A common property of these arrangements is that the resolving power is of nearly the same magnitude as the duration of an impulse from the counter (about 2 × 10^-3 sec.). Impulses occurring within a time interval shorter than this are recorded as true coincidences. The method to be described here gives a resolving power about ten times higher; at the same time, it suffers from the disadvantage that the coincidences must be recorded photographically and not by mechanical summation, as is the case with the arrangements mentioned above.