Model 44-9 Alpha, Beta and Gamma Detector
Ludlum Measurements, Inc. Page 2 December 2016
Unpacking and Repacking
Remove the calibration certificate or detector functional check
certificate and place it in a secure location. Remove the
detector(s) and accessories (if applicable) and ensure that all
items listed on the packing list are in the carton. If multiple
detectors are included, refer to the calibration certificates for
serial number (SN) matches. The Model 44-9 serial number is
located on the detectors’ bottom plate.
To return an instrument or detector for repair or calibration,
provide sufficient packing material to prevent damage during
shipment (see “Caution!” in Introduction section) and affix
appropriate warning labels to promote careful handling.
Every returned instrument must be accompanied by an
Instrument Return Form, which can be downloaded from
the Ludlum website at www.ludlums.com. Find the form by
clicking the “Support” tab and selecting “Repair and
Calibration” from the drop-down menu. Then choose the
appropriate Repair and Calibration division where you will find
a link to the form.
Specifications
Efficiency (4π geometry): typically 5% for
14
C; 22% for
90
Sr/
90
Y; 19% for
99
Tc; 32% for
32
P; 15% for
239
Pu;
≤ 1% for
99m
Tc
Sensitivity: typically 3300 cpm per mR/hr (
137
Cs gamma)
Energy Response: energy dependent (please see graphs on
page 8)
Background: 60 cpm
Dead Time: typically 80 µs
Window: 1.7 ± 0.3 mg/cm
2
mica
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