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Project 22.2 - Measurement of Prinary Alpha and Nuclear Time Interval - A. Grier
E. C. Woodvard
Measurenents of the reactior rate prio yy the break in tWe rate
ane oI
Aevice, and measurements of the time interval betveen the nuclear reactions
of the two stages of the device vere made by FCO (Patten).
THF
The device vas locate’ on a barge in the Mike crater some 750 feet
from Station 1611 on Bogon, Erivetok Atoll.
OQne LASL fluor - photomltiplier
detector, one UCRL fluor - photomultiplier detector (containing tvo benks
of photomultipliers) and three EG&G fluor- photodiode detectors vere used
to view the gamma radiation from the device.
Some collimation vas provided
by pipes 24 inches in diameter in front of the detectors seme 20 feet long
and covered with about § feet of earth fill,
The pipes in front of the LASL
photerultiplier tetector ari the most sensitive photodiode detector vere
stoppe? down to about 1°? inches,
It was desirable that the privery signal
strength could be bette
erstood, ami that the results could be correlate!
with the
results.
Therefore, a lead shield approximately
five feet square am! several inches thick with a centre] four inch diameter
hole on the line-of-sirht between the prizary of the device and the detectors
was inetalled on the barge ahout six feet from the device.
The syater was
Aesigne’ eo that the sirnals from the photomultiplier detectors ar’ the
moet sensitive
of ‘he.
totiode detector vould provide information on the operatior
primary an’ the two less seneitive photodiode Aatectore
would provide musleer time interval Information on the
device.
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