 What is the Geiger counter and how exactly is it used in the present chapters?
“You may use the Geiger counter any time you want, Eddie,” Mr. Taylor said, “as long as you take good care of it. When carefully controlled, the radiation stored up in such isotopes was used in many beneficial ways. “Anything else, Mom?” he asked, returning to the house and getting the Geiger counter out of the closet. At various rock mounds and outcroppings, Eddie switched on the Geiger counter.
 A Geiger counter is used to measure radioactivity. Eddie uses it to prospect the hills behind the college.
 A Geiger counter is used to measure radioactivity. Mr. Taylor uses it at Cedar Point.  A Geiger counter is used to measure radioactivity. Mr. Taylor uses it to measure the radiation present in the hills behind his college.  A Geiger counter is used to measure radioactivity. Eddie uses it to prospect the hills behind the college.  A Geiger counter is used to measure radioactivity. Eddie uses it to prospect Cedar Point.