THE RELATIVE PHYSIOLOGICAL EFFECTS OF beta- AND gamma-RAYS UPON THE EGG OF NEREIS.
When Nereis eggs are exposed to radiations from a tube of radium emanation, the walls of which absorb all the alpha-rays, the resulting physiological change is produced by rays having a coefficient of absorption of the order of 23.9 cm.(-1) This fact indicates that the physiological effect is due almost exclusively to beta-rays. The gamma-rays alone can produce the reaction. To produce equivalent physiological effects exposure to gamma-rays alone must be approximately 60 times as long as exposure to beta- and gamma-rays together.
Redfield
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Laboratory of Physiology, Harvard Medical School, Boston, and the Marine Biological Laboratory, Woods Hole.
Bright
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