"Investigators questioned the residents to obtain their precise locations when the bomb exploded, and used this information to calculate a personal radiation dose for each resident. Data was collected for 86,572 people.

Today, 60 years later, the study's results are clear. More than 700 people eventually died as a result of radiation received from the atomic attack:

* 87 died of leukemia;

* 440 died of tumors;

* and 250 died of radiation-induced heart attacks.

* In addition, 30 fetuses developed mental disabilities after they were born.

Such statistics have attracted little notice so far. The numbers cited in schoolbooks are much higher. According to Wikipedia, the online encyclopedia, 105,000 people died of the "long-term consequences of radiation."
"For commendable reasons, many critics have greatly exaggerated the health risks of radioactivity," says Albrecht Kellerer, a Munich radiation biologist. "But contrary to widespread opinion, the number of victims is by no means in the tens of thousands." "
....
"A final attempt to establish a connection is currently underway in Japan. The study includes 3,600 people who were unborn fetuses in their mothers' wombs on that horrific day in August 1945. But it too has failed to furnish any evidence of elevated chromosomal abnormality."
http://www.spiegel.de/international/world/0,1518,519043,00.html

The article is couple pages, and is mostly concerning a russian site, "1957 nuclear accident in Siberia were "far more serious" than Chernobyl"

Btw, the term grey is used in article [e.g. 0.45 Gray]

The gray (symbol: Gy) is the SI unit of absorbed dose.
Grey is defined as "One gray is equivalent to 100 rad".
http://en.wikipedia.org/wiki/Gray_(unit)

"The FDA suggested doses of radiation not exceed 1 Grey (Gy)"
radiation_injuries