Model 3030 & 3030E Series Technical Manual Section 6
Ludlum Measurements, Inc. Page 17 November 2017
27% for
99
Tc,
37% for
239
Pu.
Acceptable background count rates (in a 10µR/hr field ) are:
alpha: 3 cpm or less
beta: typically 50 cpm or less
(Model 3030E with 43-10-1: 50-80 cpm)
Acceptable “crosstalk” values (in a 10µR/hr field) are:
alpha “crosstalk”: 10% or less
beta “crosstalk”: 1% or less.
Using the computer interface software, perform a high voltage
plateau in 25-volt increments from about 500 to 650 Vdc. Print the
results and keep the printout with the calibration certificate.
Find the optimum operating voltage, which gives the greatest alpha
and beta source efficiencies and acceptable background (cpm), while
maintaining acceptable values for “crosstalk” between channels.
Set the unit in DPM mode with efficiencies, background subtract,
and crosstalk correction numbers from the high voltage plateau.
Set the count time to one minute and print out an MDA chart from
the interface software.
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