Abstract
1. The common planarian worm, Dugesia dorotocephala, displays a significant orientational response to increase in Cs137 gamma radiation when the increase is no greater than 6 times background.2. The worms are able to distinguish the direction of the weak gamma source, turning away from it, whether it is presented on the right or left side. The response sign is, therefore, the same as that of the response of these negatively phototactic worms to visible light.3. There is a clear compass-directional relationship of the responsiveness to the experimental gamma radiation. A conspicuous negative response is present when the worms are traveling northward or southward in the earth's field with the gamma change in an east-west axis. No statistically significant mean turning response to the gamma radiation is found when the worms are traveling eastward or westward in the earth's field with the gamma change in a north-south axis.4. The previously observed annual fluctuation in the character of the monthly orientati...
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