title: ELECTRON BOMBARDMENT OF BIOLOGICAL MATERIALS : II. THE RATE OF DEATH OF FUNGUS SPORES BOMBARDED IN VACUUM WITH CATHODE RAY BEAMS FROM 4 KV.-15 KV.
abstract: A study has been undertaken of the rate of inactivation of spores of the ascomycete fungus Aspergillus niger when bombarded in vacuum, with homogeneous beams of cathode rays of energies from 4 to 15 electron kv. and current densities of 1 x 10(-7) to 3 x 10(-6) amperes per square cm. These velocities and densities are in the range of those of showers of secondary electrons produced in biological materials irradiated with moderately soft x-rays, and so may be made to serve as quantitative indicators of the mechanics of x-ray action. Four qualitative effects are described.
authors.affiliation: Biological Laboratories, Harvard University, and the Massachusetts Institute of Technology, Cambridge, Massachusetts, and the Haskins Laboratory, Union College, Schenectady, New York.
authors.forename: R M
authors.initials: RM
authors.lastname: Whelden
authors.forename: C E
authors.initials: CE
authors.lastname: Buchwald
authors.forename: F S
authors.initials: FS
authors.lastname: Cooper
authors.forename: C P
authors.initials: CP
authors.lastname: Haskins