 Given the information in the article, what is the purpose of a Geiger counter?
Then, remembering the dream, he added, “Oh, Dad, is it all right if I use the Geiger counter today?” “You may use the Geiger counter any time you want, Eddie,” Mr. Taylor said, “as long as you take good care of it. Suddenly the Geiger counter began clicking like everything.” Still, one clue is as good as another when it comes to hunting uranium ore, I guess. When carefully controlled, the radiation stored up in such isotopes was used in many beneficial ways. One reason for asking that particular question was to keep from prying deeper into the subject of the radioisotope. “Anything else, Mom?” he asked, returning to the house and getting the Geiger counter out of the closet.
 To measure for radiation.
 To measure rock formation patterns.  To measure for radiation.  To find hidden rocks.  To measure gravity.