LUDLUM 3030, Руководство пользователя

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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.