exposure units ({roentgens).
Although the original references
pbften re~
ferred to dose, there is no evidence that whole-body energy deposition was
determined,
nor
that dose was indeed measured.
In this report all measurements of exposure intensity
given in whole units and decimal fractions.
these are reported in the source literature.
ties were usually reported in milliroentgens
intensities in roentgens
(R).
(roentgen)
This is not the c
on way
The lower exposu
(mR)
are
intensi-
and the highek
Often the same measuring device
exposure
fould meas-
ure both the lower and higher intensities but with different dial settings
and thus differing accuracies.
Personnel records show the same sort of differentiation.
T
lower
individual exposures are usually recorded in millirem but the larger maximums allowed or permitted are stated in whole rem.
This use of
Rifferent
measuring units for different levels of radiation could cause so
Sion to readers who are unfamiliar with the field; therefore, th
unit convention is used.
Radsafe Standards
In accordance with the safety criteria prescribed by the JTF
tion Plan, two kinds of radsafe standards were established; Maxi
missible Exposures. and Maximum Permissible Limits.
Opera~-
Per-
Maximum PermigBsible
Exposure, usually abbreviated MPE and sometimes referred to as th®@
"rule
dose," set 3.9 rem (gamma) over a 13-week period as the maximum ajlowable
accumulation of whole-body gamma radiation per individual during
CASTLE.
This total would increase automatically by 0.3 rem (gamma) per
week for each week the operation extended beyond 13 weeks
Annex G).
(Referente 9,
For recordkeeping purposes, the operation was assumed
15 days before the first detonation.
begin
The MPE for CASTLE was identical to
the federal standard approved by the National Committee on Radiatifn Protection (NCRP) for those in radiologically hazardous occupations.
standard permitted accumulation of radiation exposure at the rate
rem per week to a total of no more than 15 rem in one l2-month per
95