Menu
  • Home
  • Products
    • All Products
    • Health Physics
    • Medical Physics
    • Metal Recycling
    • Monitoring Systems
    • Emergency Response
    • How To Order
    • Connector Types
  • Support
    • Repair & Calibration
    • Training
    • Product Videos
    • Software & Firmware Downloads
    • Rad Calc Software
    • Warranty Plans
    • Radiation Resources
    • Gate Monitor Tech Support
  • Documents
    • Product Manuals
    • Detector Reference Chart
    • Product Catalogs
    • Response Curves
    • Test Reports
    • Technical Articles
    • End User Statement Form
    • Price List
  • Company
    • About Us
    • Ludlum Divisions
    • Directions to Facilities
    • Exhibition Schedule
    • ISO 9001 Certificate
    • ISO/IEC 17025 Accredited
    • Radioactive Material License
    • Mobile App Privacy Policy
    • Export Information
    • Employment Opportunities
  • Contact Us
    • Ludlum Headquarters
    • U.S. Contacts
    • International Contacts
    • Sales Contact Form

Ludlum Measurements Logo

(800) 622-0828 (US, CA)
(325) 235-5494
(325) 235-4672
sales@ludlums.com
service@ludlums.com
training@ludlums.com
After Hours Tech Support
For 375P & 4525 Series:
(800) 717-9506

To search products by model number, enter "m..."
(Ex: Enter "m3" to search for Model 3.)

  • Home
  • Products
    • All Products
    • Health Physics
    • Medical Physics
    • Metal Recycling
    • Monitoring Systems
    • Emergency Response
    • How To Order
    • Connector Types
  • Support
    • Repair & Calibration
    • Training
    • Product Videos
    • Software & Firmware Downloads
    • Rad Calc Software
    • Warranty Plans
    • Radiation Resources
    • Gate Monitor Tech Support
  • Documents
    • Product Manuals
    • Detector Reference Chart
    • Product Catalogs
    • Response Curves
    • Test Reports
    • Technical Articles
    • End User Statement Form
    • Price List
  • Company
    • About Us
    • Ludlum Divisions
    • Directions to Facilities
    • Exhibition Schedule
    • ISO 9001 Certificate
    • ISO/IEC 17025 Accredited
    • Radioactive Material License
    • Mobile App Privacy Policy
    • Export Information
    • Employment Opportunities
  • Contact Us
    • Ludlum Headquarters
    • U.S. Contacts
    • International Contacts
    • Sales Contact Form
Health Physics Medical Physics Metal Recycling Monitoring SystemsEmergency Response

All Products

Portable Survey Meters

  • General Purpose - Digital
  • General Purpose - Analog
  • Computerized
  • Data Loggers
  • Friskers
  • Geiger Counters
  • Intrinsically Safe
  • Ion Chambers
  • Isotope Identifiers
  • microR / microSv Meters
  • Extended Reach microR / microSv Meters
  • Neutron Meters
  • Personal Radiation Meters
  • Pocket-Size Meters
  • Scaler-Ratemeters
  • Specialized Meters
  • Stretch Scopes
  • Tritium Monitoring

Benchtop Meters

No subcategories

Scalers / Counters

No subcategories

Detectors

  • Alpha
  • Alpha-Beta
  • Alpha-Beta-Gamma
  • Beta
  • Gamma GM
  • Gamma Scintillator
  • Low-Energy Gamma Scintillator
  • Neutron
  • Sample Counter Heads
  • Sample Holders

Monitoring Systems

  • Area Monitor Controllers
  • Area Monitoring Systems
  • Air Monitors
  • Personnel Portal Monitors
  • Hand & Foot Monitors
  • Floor Monitors
  • Waste Monitoring Systems
  • Gate Monitors
  • Scrap Monitoring Systems
  • Small Article Monitors
  • Laundry Monitors

Sample Counting

  • Sample Counting Systems
  • Scalers / Counters
  • Sample Counter Heads
  • Protean Instrument Alpha-Beta Counting Systems

Pulsers

No subcategories

Dosimetry

  • Dosimeters
  • Dosimeter Accessories

Accessories

  • Detector Accessories
  • Cables, Connectors & Signal Converters
  • Handles & Straps
  • Check Sources
  • Instrument Cases
  • Audio

Medical Physics

  • Radiation Safety QA
  • Imaging QA Test Tools
  • CT / MRI QA
  • Mammography QA
  • Ultrasound QA
  • Nuclear Medicine QA

Emergency Response Kits

  • General Response Kits
  • Medical Response Kits
  • Decontamination Kits

Need Help?

Unsure about which instrument is best for your application?

Find your region's Ludlum representative or dealer.

  • US Contacts
  • International Contacts

OR

Contact Ludlum Sales:

sales@ludlums.com

(800) 622-0828 (USA Toll Free)

(325) 235-5494

Model 44-9

m44-9_profile
m44-9_profilem44-9_anglem44-9_handle


Model 44-9

Alpha-Beta-Gamma Detector CE Label

Part Number: 47-1539

The GM pancake-type detector in the Model 44-9 is one of the most popular radiation detectors used throughout the world. This alpha, beta, and gamma radiation detector has a rugged metal housing and is conveniently shaped and sized for checking contamination on people and objects.

This detector operates between 850 to 1000 volts, and is compatible with any Ludlum instrument capable of supplying 900 Vdc and an input sensitivity of 30 mV or higher.

 

  • Specifications
  • Graphs
  • Options
  • Documents
  • Replacement Parts
  • Specifications
  • Graphs
  • Options
  • Documents
  • Replacement Parts

Specifications

Indicated Use Alpha, beta, gamma survey; Sample counting
Detector Type Pancake-type, halogen quenched G-M
Window 1.7 ± 0.3 mg/cm2 mica, protected by a stainless steel screen (79% open)
Window Area Active 15.5 cm2 (2.4 in2)
Open 12.3 cm2 (1.9 in2)
Efficiency (4π) 14C 5%
90Sr/90Y 22%
99Tc 19%
32P 32%
239Pu 15%
99mTc ≤ 1%
125I 0.2%
Sensitivity (137Cs gamma) 3300 cpm per mR/hr
Energy Response Energy dependent (see Energy Response Curve on Graphs tab)
Background 60 cpm
Dead Time 80 μs
Operating Voltage 900 Vdc
Connector Series "C" (others available)
Input Sensitivity ≥ -30 mV
Construction Aluminum housing with beige powder-coat finish, stainless steel screen (79% open)
Size (H x W x L) 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in)
Weight 0.5 kg (1 lb)


Graphs

Model 44-9 Energy Response


44 9 Beta Efficiency graph


Options

Protective Screens

DescriptionThicknessOpenings% OpenPart Number
Protective Screen
(Standard)
0.25 mm (0.01 in.) 1.4 mm (0.56 in.) square 79% 21-9586
Wire Mesh Protective Screen 1.6 mm (0.063 in.) 4.8 mm (0.188 in.) square < 70% 7002-095-03
Protective Screen 0.25 mm (0.01 in.) 4.7 mm (0.187 in.) hex 92% 7002-1137
Protective Screen 0.25 mm (0.01 in.) 3.2 mm (0.125 in.) square 89% 7002-1138
Protective Screen 0.79 mm (0.031 in.) 4.7 mm (0.187 in.) hex < 70% 7002-140

 

OptionDescriptionPart Number
m2002-1050ambdosefilter
Dose Filter
The GM pancake detector has a significant over-response at lower energies, producing dose measurement errors. The dose filter flattens the response to within ± 20% referenced to 137Cs (662 keV) over the energy range of 20 keV to 1.2 MeV. 2002-1050
sample_holder_4c6951c138a2e
Model 180-2
Sample holder for 4.7 cm (1.8 in.) max. diameter samples. 47-1665

Documents

  • Data Sheet
  • Manual - English
  • Manual - Spanish
  • CE Certificate
  • Detector Clips
  • Response Curve

Replacement Parts

DescriptionPart Number
GM Tube 01-5008
Protective Screen 21-9586
Hand Grip 7002-426
Snap-In Front Cover 7002-1307
Red Protective Cap 7002-905

Related Products

model_44_9_with__4c0fa607ba51c
Model 44-9 DOSE
m44-9-18_b
Model 44-9-18
m44-40_face
Model 44-40
m44-88_angle
Model 44-88
Display #
Results 1 - 4 of 4

Ludlum Measurements, Inc.
501 Oak Street
Sweetwater, TX 79556
USA

(800) 622-0828 (US & Canada)
(325) 235-5494
(325) 235-4672
sales@ludlums.com


About Us

Ludlum Divisions

Directions to Facilities

U.S. Contacts

International Contacts

All Products

Repair & Calibration

Training

Privacy Policy


Follow Us

YouTube

Facebook

Twitter

© 2019 Ludlum Measurements, Inc.