There are many other radioisotopes in the body in addition to those listed above.Most of those omitted contribute very few decays per second, and are thus trivial compared to those in the table.
Use of radioactivity in carbon dating
The second of my reasons for not calculating dose has to do with my belief that the cell is actually a proper target for dose calculation, but we do not know how to account for repair processes which we know do exist within the body. In this location a radioactive decay has an excellent chance of doing damage to that cell's DNA.
Since every person on earth experiences about 4400 potential cell damages from K every second of their life, how is it so many of us are still here to ask such a question?
Three of the above listed isotopes, Lead-210 (C), are both continuously being created by cosmic rays in the earth's upper atmosphere.
Today, much of the Tritium in the atmosphere is manmade in nuclear reactors, but prior to the nuclear era the only source of H was cosmic ray bombardment of carbon.
Rubidium probably mimics potassium in its patterns of absorption by and distribution within the body, but, unlike potassium, it is not under homeostatic control.
The body mass of this element was obtained from ICRP 23 The Standard Man.In spite of the frequently stated phrases that "all radiation is harmful" and that "there is no safe dose of radiation", we humans contain, survive, and thrive with rather remarkable quantities of radioactive materials in our bodies.This is not unexpected, for we do live on a somewhat radioactive planet.Historically, such doses have been expressed as the total energy emitted by the radium and its daughters divided by the mass of bone in the body.Since many of the radium daughters emit alpha particles, which can produce a lot of damage, this alpha energy is multiplied by a factor to account for this increased damage.The statement is meaningless without an estimate of the risk per event.