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.
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.
Whelden
R M
RM
Biological Laboratories, Harvard University, and the Massachusetts Institute of Technology, Cambridge, Massachusetts, and the Haskins Laboratory, Union College, Schenectady, New York.
Buchwald
C E
CE
Cooper
F S
FS
Haskins
C P
CP