National Geographic : 1958 Sep
Jack Rabbit Wears a Ray-counting Collar To double-check on exhaust gases, health teams at the National Re actor Testing Station in Idaho go as far as 20 miles downwind, shoot rabbits, and analyze their thyroid glands for radio-iodine, a fallout product. They also trap live rabbits and give them meas ured doses of the iodine. The machine's count on these labora tory animals tells technicians exactly how much iodine is re quired to produce a particular level of thyroid radioactivity. This animal's red neckwear transmits the gamma-ray count to the electronic machine at right. 351 To Keep the Columbia River Safe, Hanford Men Fish for Radioisotopes General Electric Company, operator of the plutonium plant, uses Columbia water to cool reactors and returns it-slightly radioactive-to the river. En suring against damage to fish and to the people who eat them, employees net specimens and subject them to analysis for radioactive phosphorus, cesium, stron tium, zinc, copper, iron, chromium, and sodium. Activity runs far below the danger level. Super Anscochrome (above) and Kodachromes by National Geographic Photographer B. Anthony Stewart © N.G .S.