GIAPTER 1
1.1
ODJECTIVES
The primary objectives of Project 2.2 were: 1) to measure the
initial-gommn exposure rate as s fiction of time from the detonation
of high-yield thermonuclear devices; and 2) to measure the residualgacm: exposure rate as a function of tine st land fallout stations.
Secondary objectives ware: 1) tc moasure residual radiation at early
times on the crater Hip of a high-yield land-surface shoty and 2) to”t
field-test a prototype thermal-radiation detector to be used in a
rodicloticc! defense warnins systec.
1.2
BACKGROUND
Los Alemos Schemtific Laboratory (1AcL) measured initial-gacme
exposure rate versus time for high-yicld devices during Operation Ivy
(Reference 1). Tt was found that high-yield devices did nct fellow
the relatively simple scaling law of lowyield devices,
Germ
radiation at a particular distance acaies linearly with yield for
devices up to about 400 kt.
For megaton~raxe devices, gauss radia-
tion scaics higher with incroesim. yield.
This enhancement of initial-
gases yociation was attributec Largcly te the hydrodymazic cffoct
(section 133A). Us Se Arey Sign.) Rescirs’ an’ Deveivnent Laborcter
{US.SROL) obtained several germa-exposure~rate~vorsue-tine ‘datapoints
from higheyield devices during Crerction Castle (Reference 2). The
ye
y