Some details of the book
Book Title: Louis Harold Gray: A Founding Father of Radiobiology
Author: Sinclair Wynchank
Publisher: Springer Publishing
More details, including Chap 2 (13 pages, describing his early days in Maine B), are available at: http://www.springer.com/gb/book/9783319433967
When I corresponded with Sinclair about a month ago he was about to go into hospital (for a second time,) for a month. Suggest hold off contact until it is confirmed he is out of hospital.
If the book is that expensive it must have been privately published.