Rabe On Guan oeauces
The work of Henriques? suggests thet at the ¢ epth ef 0.07 mm in
living poreine akin (maximm thickness of « pidermis) that "1400 ¢ 300
roentgen-equivalent—beta" (delivered over short periods of time seo that
they may be ammed te be instantaneous) 1s required te produce recognisable transeridermal injury.
The eurve of binlogieal damage rises rather
sharply so that af a dose of just wider 2000 rep (at 0.09 an), the epidernis
may be expected to exfoliate and in the majerity of eases go on to develop
chronie radiation dermatitis persisting for mouths.
The preceding discussion suggests that, using the gamma dose rates
listed in the eriteria under this ielicy, shieh are based on an estinated 1S roentgen infinity gamma dose, as high as 2,000 reps might be delivered
to the basal layer of the epidermis over « period of tine eovered by the
lifetine of the radioactive material.
There have bean instances where the ealeulated infinity gamma dose
in ereas where persomel were present around the Nevada Proving Greunds
have reached 12-15 roentgens but there have been no know cases of beta
burns {in these areas.
The number of persons involved Eatsareas ef
highest contamination was relatively small, perhaps a few dozen, end with
an
observed duration of fallout ef about one hour it is possible that
they vere net in a position to receive the full fallout.
Likevise, minute
areas of the skin may have been so affected yet not detected or reported.
In other areas encompassing some 2,000 people the infinity gamma dece was
about eight roentgens and no instances of beta injury appeared.
2
gr-sit.
Lee HED