A rapid method of measuring sources of ionization is described. The ionizing agent is moved relative to the ionization chamber and the change in the ionization current is treated as if it were half a wave of an alternating current. This wave is amplified by means of an a.c. thermionic amplifier. The sensitivity of the apparatus is of the order of 10−12 amp./mm and it is capable of measuring radon implants at the rate of three a minute.

Topics
Electric currents, Ionization chamber
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© 1935 American Institute of Physics.
1935
American Institute of Physics
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