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If you demonstrate natural radiation with a GM counter don't forget
to mention that the typical adult contains about 9 kBq of natural
radiation. This gives about a half million disintegrations per second.
This is my first contribution to this list server. I was originally
a nuclear physicist (1952-58) since then I have been in medical physics. If
I can provide information about radiation to any readers, please feel free
to contact me directly. Best wishes for 1998! John Cameron