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years, and because of its long radiological half-life, persist at low
levels of activity for thousands of years.
However, even before the
70 year period is completed the dose rate from carbon-14 will be so
low as to be
jmeasurable.
This does not mean that the radiation is
not "there" but it will be minuscule compared to natural background
oy
levels or even to normal variations of background radiation.