Depth Controlled Deuteron Irradiation of Lactuca sativa Seeds. II. Energy Loss in the Outer Seed Layers

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Abstract
Low energy deuterons were used as probes to establish which morphological entities of the lettuce seed are responsible for ionization-induced germination. For this purpose, the deuteron retarding ability of the fruit coat and seed coat-endosperm was measured with a range cell. Bragg curves for irradiations at various deuteron energies were constructed. It is necessary and sufficient to irradiate the endosperm to overcome the dark dormancy of lettuce seeds.

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