if it is used continuously
<span>Colbalt-60 and iodine-131 are radioactive isotopes that are used in :</span><span>(3). Medical procedures</span><span>
</span>
<span>The Iridium satellite
constellation is a satellite providing voice and data coverage to satellite
phones, pagers and integrated transceivers over the Earth’s entire surface. It was
discovered by Bary Bertiger, Rey Leopold and Ken Peterson in 1987 and then
developed by Motorola from 1993 to 1998.</span>
