That is classic cold war stuff. Before you even get to the foreward by Edward Teller you get a preface stressing (among other things) that low doses of radiation are "healthful."
small doses of radioactivity are hormetic, healthful because they stimulate the immune system. This
was proven in laboratories as far back as the 1920's. With the advent of the A-bomb almost all the
hormetic research stopped. And only in the last decade has it resumed on a serious scale.
I wonder who they experimented on and whether that stuff is written up somewhere. Ionizing radiation is okay in my book, how about yours? is not exactly a common theme in modern medicine.