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Yes, our bodies are naturally radioactive, because we eat, drink, and breathe radioactive substances that are naturally present in the environment.
These substances are absorbed by our bodies, into our tissues, organs, and bones, and are constantly replenished by ingestion and inhalation.
Potassium is ingested in many foods that we eat and is a critically important element for proper functioning of the human body; it is present in pretty much all the tissues of the body.
The amount of the radioactive isotope K, implying that about 500 gamma rays are produced each second.
In both cases, however, the dose rate will be extremely small compared to the normal background dose rate.
The heavier person will receive a greater internal dose because the decay of the K produces other low-penetrating radiation (beta radiation) that deposits its energy within the body.
A photograph with a nuclear scintillation camera allows the physician to locate the damaged areas.
Potassium-40 (K concentration in the body is fairly high.
Remembering that the half-life of carbon-14 is 5700 years, then after 5700 years half as much carbon-14 remains within the organism.
Glucose tagged with carbon-11 (half-life, 20.3 minutes and positron decay mode) circulates through the body, and the positrons emitted in the heart, brain or some other organ are monitored by a PET detector.
Another way to talk about the amount of americium in the detector is to say that a typical detector contains 0.9 microcurie of americium-241. If you are holding a curie of something in your hand, you are holding an amount of material that undergoes 37,000,000,000 nuclear transformations per second.
Generally, that means that 37 billion atoms in the sample are decaying and emitting a particle of nuclear radiation (such as an alpha particle) per second.
The beta particles emitted by the sodium-24 are followed and an impaired circulation is immediately detected.