These pulses are amplified then analyzed according to
peak voltase and counted.
Nal(T1l) crystals are in wide use today as cammaray detectors because of their high efficiency ana linearity.
The disadvantase of tneir beings nysroscopic is larsely
overcome by sealing them hermetically in thin-walled aluminum containers.
For this experiment a special sample holder was made
for the spectrometer which allowed the bottoms of the
sample containers to be placed 2 inches above the top of *<
the collimator (a 1/2-inch hole through 6 inches of lead)
and centered without further adjustment.
The 4-inch in diameter by 4-inch long NaI(T1) erystal,
5-inch Du Mont photomultiplier tube, preamplifier and
housing (Fig. 1) were the same as those used in the analysis of the data from Operation PEAPOT? and are more fully
described elsewhere.’
The output of the preamplifier was fed into a Tracerlab non-overloading linear amplifier whose output pulses
were analyzed by an Atomic Instrument Company Model 510
pulse height analyzer,
the variable base line bias of which
was provided by a helipot, motor driven through its renze.”
The output voulses from the analyzer
4
were fed
into