Apparently the hull covering on oat seeds afforded some protection to the seed from X-rays, although the degree of protection varied among varieties. At X-ray dosages of 30,000r to 40,000r the large seeds were damaged more than the small ones when measured by germination percentage or reduction in seedling vigor. The damage from X-rays was not completely related to the germ sizes of the 2 seed classes.
Proceedings of the Iowa Academy of Science
©1959 Iowa Academy of Science, Inc.
Gonzalez, C. L. and Frey, K. J.
"Effect of Seed Size and Hulls Upon X-Ray Sensitivity of Oat Seeds,"
Proceedings of the Iowa Academy of Science, 66(1), 123-128.
Available at: https://scholarworks.uni.edu/pias/vol66/iss1/15