Ludlum Measurements 44-2 User manual

LUDLUM MODEL 44-2

GAMMA SCINTILLATOR

February 2018

Serial Number PR361009 and Succeeding

Serial Numbers

LUDLUM MODEL 44-2

GAMMA SCINTILLATOR

February 2018

Serial Number PR361009 and Succeeding

Serial Numbers

LUDLUMMEASUREMENTS,INC.

501 OAK STREET, P.O.BOX810

SWEETWATER, TEXAS 79556

325-235-5494,FAX:325-235-4672

STATEMENT OF WARRANTY

Ludlum Measurements, Inc. warrants the products covered in this manual to be free

of defects due to workmanship, material, and design for a period of twelve months

from the date of delivery. The calibration of a product is warranted to be within its

specified accuracy limits at the time of shipment. In the event of instrument failure,

notify Ludlum Measurements to determine if repair, recalibration, or replacement is

required.

This warranty excludes the replacement of photomultiplier tubes, G-M and

proportional tubes, and scintillation crystals which are broken due to excessive

physical abuse or used for purposes other than intended.

There are no warranties, express or implied, including without limitation any

implied warranty of merchantability or fitness, which extend beyond the description

of the face there of. If the product does not perform as warranted herein,

purchaser’s sole remedy shall be repair or replacement, at the option of Ludlum

Measurements. In no event will Ludlum Measurements be liable for damages, lost

revenue, lost wages, or any other incidental or consequential damages, arising from

the purchase, use, or inability to use product.

RETURN OF GOODS TO MANUFACTURER

If equipment needs to be returned to Ludlum Measurements, Inc. for repair or

calibration, please send to the address below. All shipments should include

documentation containing return shipping address, customer name, telephone

number, description of service requested, and all other necessary information. Your

cooperation will expedite the return of your equipment.

LUDLUM MEASUREMENTS, INC.

ATTN: REPAIR DEPARTMENT

501 OAK STREET

SWEETWATER, TX 79556

800-622-0828 325-235-5494

FAX 325-235-4672

Ludlum Measurements, Inc. February 2018

Table of Contents

Introduction 1

Unpacking and Repacking 2

Specifications 3

Operating Procedures 4

Safety Considerations 5

Parts List, Drawings and Diagrams 6

Energy Response Curve 10

Model 44-2 Gamma Scintillator

Ludlum Measurements, Inc. Page 1 February 2018

Introduction

The Model 44-2 sodium iodide (NaI) gamma scintillator is

primarily used for detecting low levels of gamma radiation in

the range of 20 keV–1.5 MeV. It consists of a 2.54 x 2.54 cm (1

x 1 in.) (Dia. X thickness) NaI crystal coupled to a

photomultiplier tube and is housed in a 0.157 cm (0.062 in.)

thick aluminum housing. The front entrance window has a total

thickness of 2.3 mm (0.09 in.) of aluminum. The detector is

energy dependent, over-responding by a factor of 10 or greater

in the 100keV range and under-responding by a factor of 0.5

above 1 MeV when normalized to 137Cs.

The Model 44-2 will operate with any Ludlum instruments or

equivalent instruments that provide 500–1200 volts. The

recommended instrument input sensitivity is approximately 10

mV or higher.

Some common applications for this detector include

background radiation monitoring, low-level radiation detection,

and spectrum analysis when used in conjunction with a single-

or multi-channel analyzer.

Model 44-2

Note:

The detector does not contain any consumable materials.

Model 44-2 Gamma Scintillator

Ludlum Measurements, Inc. Page 2 February 2018

Note:

If the detector is used in a manner not intended by the

manufacturer, the detector may not function properly.

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.

To return an instrument or detector for repair or calibration,

provide sufficient packing material to prevent damage during

shipment, 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.

Model 44-2 Gamma Scintillator

Ludlum Measurements, Inc. Page 3 February 2018

Specifications

Compatible Instruments: general-purpose survey meters,

ratemeters and scalers

Sensitivity: typically 175 cpm per µR/hr (137 Cs gamma)

Dead Time: approximately 10 µs, typically limits linear range to

5 mR/hr (50 µSv/h) with non-corrected

measurements, or to 50 mR/hr (500 µSv/h) with

electronics equipped with dead time correction

Energy Response: energy dependent

Background: 1800 cpm

Operating Voltage: 500–1200 volts

Dynode String Resistance: 100 megohm

Connector: series ˝C˝(others available)

Scintillator: 2.5 x 2.5 cm (1 x 1 in.) Dia. x thickness)

Tube: 2.9 cm (1.1 in.) diameter magnetically shielded

photomultiplier

Efficiency (4 π): 125I is 7%; 57Co is 10%; 137Cs is 3%; 60Co is 3%

Construction: aluminum housing with beige powder-coat

finish

Temperature Range: -15 to 50 °C (5 to 122 °F); may be

certified for -40 to 65 °C (-40 to 150 °F)

Size: 5.1 x 18.5 cm (2 x 7.3 in.) (Dia. x L)

Weight: 0.5 kg (1 lb)

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