Model 3030 & 3030E Series Technical Manual Section 6
Ludlum Measurements, Inc. Page 14 November 2017
Calibration and Maintenance
Calibration
The following calibration procedure is applicable to the Model 3030.
Adjustments are necessary if this procedure is used with the Model 3030E.
Where applicable, those changes will be noted with regard to the most
common external detector used – the Model 43-10-1. Other instrument
detector combinations are not covered in this manual. Consult the individual
detector manual for the needed specifications.
A Ludlum Model 500 Pulser or equivalent is required. If the pulser does not
have a high-voltage readout, use a high-impedance voltmeter with at least
1000 megohm input resistance to measure the detector voltage. Calibrated
sources are also required.
Recommended Sources
The recommended sources for use with the Model 3030 are plated
239
Pu
alpha and
99
Tc beta sources. These sources are 3.2 cm (1.3 in.) disks with an
active diameter of 2.5 cm (1 in.). These disks are then mounted in a
protective ring with an outside diameter of 4.8 cm (1.9 in.). We feel that this
type of source construction protects those vital dpms. The recommended
size is as large as possible. Keep in mind that you want good statistics, and to
do that you want large numbers in a short amount of time. If you want to
count for 60 seconds, than a source size of about 20,000 dpm will generally
result in counts (given a 15% 4π efficiency) of 3000 counts. Counting this
size source in a tenth of a minute will result in a count of only about 300
above background, and your percentage error will be greater. Increasing the
size of the source to 200,000 dpm gives you better statistics, while allowing
you to keep the count time short.
Calibration Procedure
Perform mechanical checks, such as switch function and
illumination of digital readouts.
To Next Page
Loading...
Need help?
General
