ay
sammie ccurtieg.
Desaite the Aisa dbeta-to-g-me seasitis
tor,
Sa=ple counting was, Cherefore, Contimed after the puracaule=
°
i
.
.
-o
:
auspermed move cone dropped out of tne resica of nish sama flux caril ispact
wilaA Bae Occsn.
Teo views of the oeutron-Jdetector assembly ara shown in Figs. 3.2 am 3.5.
The detector consisted of a pbotomultiplicr tube having a terphen.] activatedplastic scintillator, 0.030 inch thick by 1 incd in diaseter, an integrated
counting-rate amplifier to drive a subcarrier oscillator, and a wheel ts hold
the activation sasples.
The sazples were stepped pase the scintillatsr by 1
Geneva stop oaechanisa driven by a saail eleceric aocor.
The sanple steel,
except for an access hole for the photomultiplier and wheel-drive sbait, was
surrounded by 2 cencizeters of powdered boron 10 in a 1; K-inch-chick steel
container.
Ta addicion to the activation saaples, a blank (background) position was
included in the wheel.
To extend the range of neutron flux wnich aight be
deteceed, each sample was counted on different sensitivity ranges of the detector on alternate revolutions of the wneel.
Samples were calibrated by expo-ing
the entire detector assembly to the flux from the Galiva II and Cockrofit-walton
facilities at Los Alamos.
Nooinal calibratioo data for a fission foil are
given in Fig. 3.4.
Figure 3.5 shows two views of an instrus>ent aose cone with location of
major components indicated.
Additional sulfur samples on all stations aad
fission foils io a boron 10 canister on the two highest stations of both Teak
and Orange were included for laboratory counting.
These were located on the
shelf impediately below the neutron detector but are not visible in rhe
illustration.
3.2.3
Data and [nseriment Performance
Resules of neutron data obtained froa Teak and Orange are scmarized in
Table 3.1.
Four of six instresent nose cones on Teak and teo oct of three on
Oranse were recovered, sersitting lahoratory evaluarian of ras arriverian foil:
The recovered fission and zirconius foils sere csunted at Jonn>oton Islaxc; the
sulfur sasples sere flown t> Eniwetox.
Laboratory anaissis of these racreered
Nar
ay
-)
saxples eaa> deriorved by Project c.-+. All sacples from Teak Statiras 27% and