Models 43-93 & 43-93-2 Technical Manual Section 1
Ludlum Measurements, Inc. Page 1-1 March 2016
Introduction
he Model 43-93 and 43-93-2 detectors are designed for alpha-beta
surveying when coupled with compatible instruments. Functionally,
these two detectors are very similar but differ in the type of protective
window screen and the size of the active and open window areas.
Discriminating between alpha and beta radiation simultaneously requires the
counting instrument to have either separate power supplies or
window/threshold controls for each channel. The Ludlum Model 2929 Scaler,
Model 2223, Model 2224, or Model 2360 instruments provide the necessary
circuitry for simultaneous alpha-beta discrimination.
A Zinc Sulfide [ZnS (Ag)] scintillator is used for detecting alpha particles, and a
thin plastic scintillator is employed for detecting beta radiation. The scintillation
material is covered by metallized Mylar to reduce light response, limiting
excessive background counts. The Model 43-93 window is protected by an
88% open square-hole screen, where the Model 43-93-2 window is protected
by a 79% open hexagonal-hole screen.
The photomultiplier tube (PMT) and crystal assembly may easily be removed
for repair. Refer to the assembly view drawing in section 5 of this manual for
details on construction and parts. The photomultiplier tube typically operates
between 500 and 1200 volts with a recommended maximum of 1500 volts.
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