He describes the work he did and the conclusions he drew. The results were not what was being predicted and claimed. Much less cancer and genetic abnormalities were demonstrated to have occurred and this antedated the discovery of cellular mechanisms which repaired damaged DNA which explained his results.
After he had completed his work, he was posted to the Amazon to do genetic studies of the Amazonian inhabitants before they were too effected by contact with European culture, germs and land development.
The results of these studies were also far from what was expected before they were done.
An essential read for anyone blinded by the anti-nuclear phobia used to argue against use of radioactivity for power generation and in medicine.