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

Full Article  |  PDF Article
OSA Recommended Articles
The Ballistic Method of Ionization Measurement With A Quadrant Electrometer

David L. Webster and Robert M. Yeatman
J. Opt. Soc. Am. 17(3) 248-253 (1928)

Wide Range Intensity Measurements in Photoelectric Spectrophotometry

Walter C. Bosch and Barremore B. Brown
J. Opt. Soc. Am. 29(11) 466-469 (1939)

On the Wilson Cloud Expansion Chamber

A. W. Simon and D. H. Loughridge
J. Opt. Soc. Am. 13(6) 679-697 (1926)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription