2.4.13
UW-1
The UW-1 underwater instruments functioned excellently.
When check calibrated, they were found to retain accuracy with no
drift.
2,4,14
Rad-Chem Trailer Equipment
The radiation measuring equipment in the Rad-Chem trailers
functioned adequately.
The Berkley Model 2000 scalers presented
some trouble, but were generally accurate and reliable.
These units
were calibrated and tested with a Rutherford Model 300 pulse generator using a 0.25 volt,
1ms rise time,
2 msduration, negative pulse,
The best GM tube was the Tracerlab TGC-2 with a window
thickness of less than 2 mg/cm’, which gave counting efficiencies of
from Z0 to 30 percent,
The alpha counter head and amplifier-power supply system
functioned well for low level alpha counting, providing good discrim-
ination against beta and gamma pulses.
The laboratory monitor, SU-3B, was used to monitor bench
tops and miscellaneous items.
Initially the voltage regulation at the Site Elmer trailer was
poor, due to a defective Sorenson voltage regulator.
The voltage reg-
ulation stability was carefully examined with a fast trigger oscilloscope,
and line disturbances were damped out by careful tuning to resonance,
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