A Difference between Biological Effects of Gamma Rays and Heavy Ions

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Science  04 Nov 1960:
Vol. 132, Issue 3436, pp. 1311-1312
DOI: 10.1126/science.132.3436.1311


When irradiated with gamma rays, Arteinia eggs show the typical sigmoidal survival curve of a multicellular organism, with little change at low doses and an abrupt decrease in survival above a threshold dose. On irradiation with 160-Mev oxygen ions, the threshold disappears and viability can be destroyed by passage of a single energetic ion.