Response of Nuclear Emulsion to Electron Beams

Authors

• Robert Katz, University of Nebraska-LincolnFollow
• E. J. Kobetich, University of Nebraska-Lincoln

Document Type

Article

Date of this Version

January 1970

Comments

Published in Nuclear Instruments and Methods 79 (1970), pp. 320-324. Copyright © North-Holland Publishing Co./Elsevier. Used by permission. http://www.sciencedirect.com/science/journal/01675087 Supported by the U. S. Atomic Energy Commission and the National Science Foundation.

Abstract

A recent theory of particle tracks assumes that the probability P for grain development in nuclear emulsion depends on the local dose E of ionization energy deposited by secondary electrons (delta rays) in the neighborhood of the particle track. The response is assumed to be one of exponential survival; that is, if E₀ is the dose for 37% survival, then P = 1 – exp (-E/E₀). By calculation of the dose E(t) deposited at depth t in the emulsion by normally incident, monoenergetic electron beams, and applying the assumed dose-effect relationship, response curves giving blackness versus electron fluence are obtained, in terms of E₀ and a second parameter combining the effects of the density of undeveloped grains, the developed grain size, densitometer optics, and light scattering. Calculated and measured curves are compared.