Project 2.1 - Garma Exposure vs Distance - P, Brown
OBTFECTIVE
.
The object was to measure initial and residual gamma radiation
using NBS type film badges, quartz fiber dosimeters, and chemical
dosimeters,
DESCRIPTION AND EXPFRIMTNTAL PROCPDURES
Standard film taiges and quartz fiter dosimeters were distributed
at varicus positions throughout Pikini Atoll] anj on the ship stationed
in the predicted fallout area.
Some baires were exposed without
interruption, while others were exposed in sequence or shielded from
the fallout by dropping mechanisms activated after blast arrival.
RESULTS
.
Since all of the results are total expcsures it was necessary to
estimate the amount of residual in crier to evaluate the initial gamma
exposure.
The estimates were based on known residual exposures at
Similar stations just outside the range of initial exposure and on
rclative recovery times and recovery rates,
The estimated residual
contamination was 150 roentgens for the land stations and 15 roentzens
for the reef stations from Airukiiji through Pniirikku.
Since
individ-
val residual exposure values may fluctuate, the value of initial data
from a few of the stations is questionable.
all of the data should be of value.
However, a curve based on
Table 2.1-1 gives the initial results.
CONCIUSTONS
The initial gamma exposure results are in reasonable agreement
- 29 ~
Qs
with predictions contained in TM 23-200,