to plaques containing different radiolact:pes.
Pertinent data are abstracted
as follovs!
Surface Dose Required to Produce
Recognisable Transepidermal
dsotove Energy
Tttriuw’?
41,5
Injury {Roentgen—eyuivalent-
beta)
1, $0
Strontiua% 0.6)|
Yttriuon%
a
Estimated Amount df
Radiation That Pene-
,
1,5
2.2
trated Skin to A Depth
1,200
1,400
The average seximon energy of tne beta particles from fallout material
weries with tious but will be assumed to te roughly comparable, in respect to
depth dose, to ‘ttrias’ or sr%-1%. since the gamma dose at a depth of
7 mg/ow would not be significantly different fron the surface ganme dose,
the ratio of 13)
te 1 for beta-gams ++ >" be assured at the basal layerof
the epiderais.
(One experiment with sheer, using Sr%-Y90 plaques, showed that 2500
reps et the plaques’ surface produced nireration in one but not another of
two sheep.®
O the other hand, 1X00 rat1 delivered to tissue depth of
7 ng/ca” from s P?? one inch diameter di afiyre of anizal not stated} produced
tanning, prolonged erythexs ar
desuasat ion. ©*]
It is to be remembered that the asove discussion was first based on
furface gamma dose rates whereas the monitors will be making thelr garma
@"Conparative Study of Experimentally Produced Beta Lesions and Skin Lesions
in Utah Renge Shee;*, Lushbaugh, C.E£., Spalding, J.F. and Hale, D.B, LASL
Boverber 30, 1953 {UNCLASSIFIZD) .
*OHV—33068
A statur report.
Sert. 148, 1944 (CONFIDENTIAL).