LUDLUM 3030E-2 User Manual

Model 3030 & 3030E Series Technical Manual Section 6
Ludlum Measurements, Inc. Page 16 November 2017
Press the COUNT button. When count cycle is complete, multiply the
β BETA LCD reading by 10 and confirm that this reading is within
±2% of the incoming count rate. Repeat this step with 200 mV
pulses and check the α-ALPHA LCD reading.
 The objective of the next steps is to find an operating voltage for the
detector that will yield the detector’s stated efficiency while not over-
counting the background radiation field. The 2π efficiency (Eff) is
calculated as:
Instrument Count Rate
×100% = Eff
cpm of Source
In addition, “cross talk” must be considered for determining
the optimum operating voltage and is defined as:
Alpha “cross talk” =
αSourceCβ - BackCβ
×100%
αNetCα
and
Beta “cross talk” =
βSourceCα – BackCα
×100%
βNetCβ
where
αSourceCβ = α source count in β channel
BackCβ = background count in β channel
αNetCα = Net α source count in α channel
βSourceCα =β source count in α channel
BackCα = background count in α channel
βNetCβ = Net β source count in β channel
 For the alpha/beta scintillation detector, applicable 4π efficiencies
are:

LUDLUM 3030E-2 Specifications

General

Brand	LUDLUM
Model	3030E-2
Category	Measuring Instruments
Language	English