## Research Papers in Physics and Astronomy

#### Date of this Version

January 1970

#### 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 *E*_{0} is the dose for 37% survival, then *P* = 1 – exp (-*E*/*E*_{0}). 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 *E*_{0} 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.

## Comments

Published in

Nuclear Instruments and Methods79 (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.