Examination of the inner structure of optically opaque objects by x-rays or other penetrating radiation; radiology.
When the horrible penetrating radiation from the fire passes through his unprotected body, it will be as clean as a bullet through the glass, with relatively little damage.
Is it possible that this substance,spontaneously and without any previous excitation,emits some invisible,highly penetrating radiation that can pass without difficulty through the cover of the box and the black paper and affect the photographic emulsion?
