i.SEI (20%)
Project 2.71 - Relative Importance of the Various Radiation Sources
to the Ship Shielding Problem - H. R. Rinnert
OBJECTIVES
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To determine the relative radiation dose rates contributed by
contamination of the air envelope, water envelope, and the ship's
weather surfaces,
To determine the time dependent gamma ray combined absorption
and seattering coefficients of stecl to be used in future calculations
of shielding effectiveness,
Te ficli test new ani improved detector systems.
To obtain gamma radiation measurements at various points on and
in the ship as a function of timc for the following purposes:
Cheek points for future shielding calculations.
Petermination of the radislogical situation at various
locations aboard ship for Projects 2.63 and 2.10, to be used for
Operational control of the test ships.
INSTRUMTT ATION
YAG-40 received enough contamination to supply data to satisfy
all objectives.
Only YAG-40 data have been reduced to date.
The in-
strumontation performed satisfactorily.
RUSULTS
Relative Gamna Radiation Fielis Contributed by Various Radiation
Sources
"Free field" measurements were compared, these free fields are
defined as follows:
Water free field - 4 pi radiation field at a water
COMIP eae 3
L
~ 50 =
QI
depth of between 20 and 30 feet; Air free field - 2 pi radiation field