I came across the book The Bells of Nagasaki by Takashi Nagai in a book store here several years ago and have read the book two or three times since. I was utterly amazed that such a book exists and such a man as Mr. Nagai, a Catholic convert doctor, had lived in and survived the atomic bombing of Nagasaki.
Here is the description from the back cover :
“Among the wounded on the day they dropped the bomb on Nagasaki was a young doctor who though sick himself, cared for the sick and dying. Written when he too lay dying of leukemia The Bells of Nagasaki is the extraordinary account of his experience. It is a deeply moving and human story.”
The book is available on Amazon.com http://www.amazon.com/Bells-Nagasaki-Japans-Modern-Writers/dp/4770018452
An article on the author at wikipedia http://en.wikipedia.org/wiki/Nagai_Takashi