Model 115 "Super Scintillator" (1953)
by Precision Radiation Instruments of Los Angeles California, the “Super
Scintillator” was one of the first survey instruments to employ a NaI
scintillator. The NaI crystal,
small by today’s standards, was 1.5” x 1”. The electronics and probe
were housed in a 5” x 11” x 14.5” case. Since the Super Scintillator
was specifically designed for airborne and vehicle gamma surveys, it allowed
the user to set a shorter time constant than was employed with typical
hand-held systems – this facilitated operation at high speeds. For surveys
from aircraft, the manufacturer recommended speeds under 100 mph and
altitudes of 50 to 100 feet. A pilot light was employed to guard against
leaving the unit turned on. Two jacks were provided so that it could be
connected to a continuous strip recorder.
particular instrument is of very early construction: the scale on the meter
was numbered by hand and the small meter found in later versions on the
outside of the case is missing in this example. A stamp in the instruction
manual that came with the meter states that it was received by Radiation
0 – 0.025, 0 –
0.05, 0 – 0.25, 0 – 0.5, 0 – 2.5 and 0 – 5 mR/h.
eight 1.5 volt, four 67.5 volt, and two 22.5 volt
Dimensions: 3.5" x 12" x 15"
Price: $595.00 in 1954.
For some reason, maybe it was just a part of being in LA, Precision Radiation Instruments was also in the music business. While none of the PRI-owned labels (Craftsman, Tops, etc) were household names, they did produce records for some reasonably well known entertainers such as Mel Torme and Lena Horne. One PRI 33 1/3 record worth mentioning: "If the Bomb Falls," a primer on surviving a nuclear attack.
Donated by the U.S. Department of Energy, Oak Ridge Operations
AEC Radiation Measuring Instruments,
RIB-8 (supplement 2)
Precision Instruments catalog, form
1001B, 1954 copyright;
Instruction Manual for
Model 115 “Super Scintillator,” no date on manual but circuit diagram is
Copyright 1999, Oak Ridge Associated Universities