Factor
ce'!
Hg""8
0.186
0.282
Au98
cst
Sc*®
Co™
kK?
Na*4
Shelf
0.355
0.623
0.884
1.000
4
of 44-inch diameter collimator: 13.95 cm
1.312
Calibration standards: Ba!™, Ce#!, Hg%3, Naz,
and Cs!"
Calibration procedure: one per day and one following each adjustment of amplifier or detector voltage
Counting procedure: equal counting times for each
series on a given sample
A.2.4 Well Counter.
Nuclear-Chicago Model DS-3
Crystal dimensions and type: 14-inch diameter
x2 inches thick, NalI(T1)
Well dimensions: *{-inch diameter x 1/4 inches
deep
A.2.6 Doghouse Counter (Reference 43)
Photomultiplier tube type: 6292 DuMont
Crystal dimensions and type: 1-inch diameter x 1
Sealer type: Model MPC-1 Berkeley, or Nuclear
Instrument Corporation 162 with Nuclear-Chicago 182
in tandem
inch thick, Nal(T1), Harshaw aluminum absorber '4-
Pb shield thickness: 144 inches, with -inch diam-
eter hole above crystal weil; additional 2-inch thickness in YAG 40 laboratory
Counting rate versus sample volumein test tube
(15 x 125 mm):
Sample
Relative
Volume
Count Rate
ml
Counting chamber dimensions: 20 x 24 x 34 inches
100
99.2
90.6
Counting efficiency for several point-source nu-
clides, centered in bottom of tray with ‘4-inch alu-
Efficiency for several nuclides:
Aus
Co®
ist
minum cover in place:
Efficiency
counts /dis
—_
inch thick
Photomultiplier tube type: 6292 DuMont
Scaler type: Model 162 Nuclear Instrument Corporation, and Model 182 Nuclear-Chicago (in tandem)
Pb shield dimensions (detector): 10-inch diameter
x 20 inches high x 144 inches thick
Pb shield thickness (counting chamber): 2 inches
high
Size of hole in roof of counting chamber for detector: 7-inch diameter
Distance from bottom of sample tray to bottom of
crystal: 36 inches
Sample tray dimensions: 18 x 21 x 2 inches deep
pet
0.01
1.81
3.9 (~ well depth)
, rT,
cm
2.07
4.76
5.25
6.84
Tray distance from bottom of detector when outside
1.205
Nuclide
Distances.
worn
Nuclide
Nuclide
—
Na
0.42
0.936
set8
1.16
Co”
Nb*s
Cs!37_paistm
Ce!
Au!
He?3
Minimum count rate requiring coincidence loss
Correction: 1.0 x 10° counts/min
Counting procedure: minimum of 10* counts to
maintain a statistical error of ~ 1.0 percent
1.70
Na”
K#
0.43
0.51
counts/dis x 1074
0.151
1.02
0.506
0.548
0.622
0.711
0.842
Relative counter photon efficiency, computed for
A.2.5 20-Channel Analyzer.
Crystal dimensions and type: 2-inch diameter x 2
total aluminum thickness = ‘4 inch (3.43 gm/cm?):
inches thick, Nal(T1)
Glow transfer tube types: GC-10B and GC-10D
Fast register type: Sodeco
Voltage gain (with delay line pulse shaping): 1,000
Attenuation (with ladder attenuator): 63 decibels in
I~decibel steps
Pb shield thickness: ~ 2 inches
Counting chamber dimensions: 8-inch diameter
«314 inches high
Shelf distances from bottom of detector:
163
Energy
Mev
Efficiency
pet
0.01
0.02
0.03
0.05
0.07
0.10
0.15
0
0.0034
3.24
33.3
48.7
57.8
63.7