 What is Eddie's response to Teena's mother's concern over the missing isotope?
Still, one clue is as good as another when it comes to hunting uranium ore, I guess. In fact, anything having to do with atomic science excited him. You couldn’t have a father who was head of the atomic-science department at Oceanview College without picking up a little knowledge along the way. 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. His father usually volunteered any information he wanted known, so Eddie stuck to questions which could and would be answered. 20 Eddie went inside and followed Teena to the kitchen.
 He tries to comfort her by explaining isotopes.
 He only causes more concern for her after explaining isotopes.  He acts equally as concerned as her.  He tries to comfort her by explaining isotopes.  He tries to demonstrate his knowledge of radioactivity to her.