They depend on the kind and nature of the incident radiation(X-rays, Î³-rays, Î±-particles, Î²-particle, or neutrons).It also depends on the energy loss of the particular radiation and the associated ionisation effects in the human body material.
Footnotes are created using the Cite.php software extension. This extension adds the HTML-like elements, and. The elements are also used in a number of templates; for example, it is becoming more common to use {{ reflist }} rather than as it can style the reference list.
If the footnote refers to the last word / phrase from that sentence, then the footnote should be inserted before the punctuation mark. If the footnote refers to the whole sentence, then I would insert it after the punctuation mark. This is from my own experience-sorry, but I don't know any manual to refer you to.