Abstract

An apparatus for measuring radiation intensity over a wide range of wave lengths is described. This apparatus consists of two parts: (1) a condenser unit to which an ionization chamber is attached, and (2) an improved type of string electrometer, including a static charger. The condenser unit, with the electrometer attached, can be charged to a known potential, after which it is removed and placed with its ionization chamber in the field of radiation which is to be measured. After the chamber has been exposed for a specified length of time, the condenser unit with the attached ionization chamber is again connected with the electrometer and the loss of charge is directly read on the scale. This loss of charge can be converted into r units if the material from which the ionization chamber is constructed and the size of the chamber are properly selected, and if the electrical factors of the instrument are known. Radiation intensities for the range of wave lengths from 0.02 to 3A measured with this instrument are given.

© 1928 Optical Society of America

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