at ee tat}: wo caela) LK cr)Loh -eal el 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.