Inactivation Cross Sections of Dried Invertase and Ribonuclease as a Function of LET

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Abstract
The inactivation cross sections of dried invertase and ribo-nuclease were determined as a function of linear rate of energy loss (LET) from deuterons and alpha-particles. The curves obtained show a discontinuity between the deuterons and alpha-particles. The discrepancy is explained on the basis of gamma-rays, and a correction for this is applied. The resulting corrected curves fit the direct-action radiation target theory for ionizing particles, and some molecular parameters are estimated for these 2 enzymes. The invertase data is fitted by a cylindrical molecule 47 A in diameter and 147 A long with a molecular weight of 200,000. The ribonuclease molecule appears to be spherical with a molecular weight of 27,000.

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