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RADIATION STANDARDS, INCLUDING FALLOUT
Representative Hosmer. To the gonads. The Federal Radiation
Council chart indicates 10 to 25 millirems per year which works out
to about 6 percent as compared to your 114 percentfigure.
Dr. Taytor. That is from all tests through 1961. I was givingit
for l year. (See statement below.)
Representative Hosmer. You mean that is cumulative or yearly?
It says 1 year in the column ontheleft-handside.
Dr. Taytor. I would have to study this report to know precisely
what that figure means.
Representative Hosmer. Wouldyoulike to submit a short statement
comparing yourfigures with theirs?
Dr. Tartor. I will try to do this.
(Subsequently, Dr. Taylor submitted the foHowing supplementary
‘statement :)
EXTENSION OF TESTIMONY PRESENTED BY LAURISTON S. TAYLOR
In my testimony on June 4 there were some questions regarding the sources
of data used, as well as the end results presented. . Some further information and
the correction of one step is given below, relative to the statements comparing
the medical to the total average per capita genetic dose of the population.
The paper as presented was not specific in stating that the figures related to
gonadal dose for a 30-year period. Within the limits of accuracy, they also
apply to whole body exposure.
With regard to natural radiation, I prefer to use a figure of 125 millirems
annual average per capita dose rather than the rounded-off figure of 100 millirems
per year. I believe that a similar value is used by the United Nations Scientific
Committee on the Effects of Atomic Energy in its 1958 report. For later comparisons, the value of 125 gives a dose from natural background of 3,750 millirems over a 30-year period.
Medical procedures in the United States contribute to the average per capita
dose at a rate now variously estimated at 33 to 50 millirems per year. (Norwood
et al., 1959, 45 millirems; Lincoln and Copton, 1958, 50 millirems; FRC Rept. No.
3, 1962, 33 millirems.) I have chosen the highest figure as being the least conservative, as far as medical practice is concerned. On this basis, the 30-year
contribution to the average per capita dose is 1,500 millirems; this is less than half
the dose received from natural sources.
The contribution to the average per capita genetic dose by radiation workers
is probably less than 0.5 millirems per year, or 15 millirems over 30 years.
The 30-year average per capita genetic dose to children born in 1962, resulting
from all past tests, is approximately 60 millirems (derived from Dunning,
TID-14377, 1962). This is the figure used by Dr. Langham in his testimony
of June 5 and is the lower figure of the range specified in FRC No. 3, table I.
The sum of these average per capita genetic doses is as follows:
Millirems
Natural
eee
3, 750
Medieal____..ee e 1, 500
Occupational__________-_--_.---- eee
15
Fallout_____.---------------~------_---~ +e
60
Total____.---------------------..------------ eee ee 5, 825
On the basis of these figures, fallout contributes 9%30, of the total or 1.1
plus percent of the total average per capita genetic dose. (My original statement said “less than 1.5 percent,”’ which is in agreement with the more precise
value stated above.) It is my own opinion that the estimates for the various
doses above may be in error by as much as 25 percent each.
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