The Green Glass Sea by Ellen Klages is about a young girl who goes to live at Los Alamos New Mexico where her father is working on developing the atomic bomb.
Klages does a great job of making the time and setting seem realistic, but there's more to the book than that. It isn't just another historical fiction novel with a story that's sort of an excuse to teach about history. The believable characters would have made entirely different choices and had different concerns if the setting were not the same. No wonder the book won the Scott O'Dell award for historical fiction.
Klages never mentions the problems Los Alamos families experienced because of the radiation, but perhaps she goes into that in the sequel.