Note, by April 1947, the AEC had already prohibited some of the experiments on humans, as the document below describes. Unfortunately, radiation experimentation on humans did not end in 1947, as the government's own ACHRE report makes clear.
April 17, 1947
U. S. Atomic Energy Commission
P. O. Box E
Oak Ridge, Tennessee
Attention: Dr. Fidler
Subject: MEDICAL EXPERIMENTS ON HUMANS
1. It is desired that no document be released which
refers to experiments with humans and might have adverse
effect on public opinion or result in legal suits.
Documents covering such work field [sic] should be classified
"secret". Further work in this field in the future has been
prohibited by the General Manager. It is understood that
three documents in this field have been submitted for
declassification and are now classified "restricted". It is
desired that these documents be reclassified "secret" and
that a check be made to insure that if distribution has
inadvertent been made to the Department of Commerce, or
other off-Project personnel or agencies.
2. These instructions do not pertain to documents
regarding clinical or therapeutic uses of radioisotopes and
similar materials beneficial to human disorders and
ATOMIC ENERGY COMMISSION
O. G. HAYWOOD, JR.
Colonel, Corps of Engineers.
AUTHORITY : DOE/SA-20
By H.R. SCHMIDT, DATE: