Ludlum Measurements 43-93, Manual, Page: 6 / 18

Models 43-93 & 43-93-2 Technical Manual
Section 2
Ludlum Measurements, Inc. Page 2-1 March 2016
Specifications
0
Photomultiplier Tube
: 2.9 cm (1.1 in.) diameter; magnetically shielded
Scintillator Material
: Zinc Sulfide [ZnS (Ag)] deposited on a 0.25 mm
(0.010 in.) rectangular plastic scintillator
Window
: 1.2 mg/cm
2
metalized polyester
Window Area (Model 43-93)
:
Active area
: approximately 100 cm
2
Open area
: approximately 88 cm
2
Window Area (Model 43-93-2)
:
Active area
: approximately 126 cm
2
Open area
: approximately 100 cm
2
Efficiency (4  )
:
Model 43-93
: typically 15% for
99
Tc, 20% for
90
Sr
90
Y, and
20% for
239
Pu
Model 43-93-2
: typically 10% for
99
Tc, 17% for
90
Sr
90
Y, and
15% for
239
Pu
Background
(in a 10
µ
R/hr field):
Alpha: 3 cpm or less
Beta: 300 cpm or less
Response Uniformity
: 10% or less from average reading
Operating Voltage
: typically 500-1200 Vdc (1500 Vdc max.)
Section
2