I recently had to study for the Radiation Health and Safety exam. I borrowed a copy of this book to quiz my knowledge on the subject. I plan on buying a copy to keep for myself. I not only strenghtened the knowledge I already had, but I also learned facts that I wasn't aware of. This book is detailed and extremely easy to use. The answers are given with an explaination. Any one that is studying for a test or anyone that just wants to keep sharp on a subject will benefit from this book.