Se
hundred roentgens at a single exposure,
The British report is
totally reassuring on the effects of occupational exposures
on fertility,
Chapter IV 1s a very lengthly genetics effects discussion
with many figures, tables and calculations and a critique of the
Atomic Bomb Casualty Commission genetics study in Japan,
This is
a highly technical discussion and comes out with the same
conclusions as does the National Academy of Sciences, namely that
a dose of radiation which would double the mutation rate of a
relatively small group of prospective parents would produce no
noticeable effects,
'For levels of radiation up to the doubling
dose, and even some way beyond, the genetics effects of radiation
are only appreciable when reckoned over the population as a whole
and need cause no alarm to the individual on his own account,"
Chapter V discusses natural radioactivity - radiation from
appurtenances of civilization and occupational exposure to
radiation,
The report concludes that diagnostic medical x-rays
produce exposures to the germ cells of the order of 22% that of
background and constitute the most important source of man made
irradiation,
It is estimated that the United Kingdom Atomic
Energy Authority's employees receive an average dose of 0.4
per year,
The estimated external radiation exposure to people in
Great Britain from fallout from all past nuclear tests has been
quite minimal,
"“~---Including all ordinary atomic bombs exploded
before December 1955,
and calculating all the radioactivity which
they have contributed and will contribute over the next 50 years,
it is found that the total dose which a man, continuously out of
doors, night and day, would receive is 0,005r.
To this dose
from ordinary atomic bombs must be added the dose of thermonuclear
-~ 19 -
Enclosure IIT