(800) 622-0828 (US, CA)
(325) 235-5494
(325) 235-4672

Field Service Support

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

Health Physics Medical Physics Metal Recycling Monitoring Systems Emergency Response

Health Physics

Portable Survey Meters

Personal Radiation Meters

No subcategories

Benchtop Meters

No subcategories

Scalers / Counters

No subcategories

Pulsers

No subcategories

Detectors

Monitoring Systems

Ground/Floor Surveying

No subcategories

Sample Counting

Tritium Monitoring

No subcategories

NORM Kits

No subcategories

Dosimetry

Accessories

Need Help?

Unsure about which instrument is best for your application?

Find your region's Ludlum representative or dealer.

OR

Contact Ludlum Sales:

(800) 622-0828 (USA Toll Free)

(325) 235-5494

Newsletter

m43-90

m43-90

m43-90_face

Model 43-90

Alpha Scintillation Detector

Part Number: 47-2448

Specifications

Indicated Use	Alpha survey
Detector Type	ZnS(Ag) scintillator
Window	0.8 mg/cm² aluminized Mylar
Window Area	Active: 125 cm² (19.4 in²) Open: 100 cm² (15.5 in²)
Protective Screen	0.76 mm (0.030 in.) stainless steel, 6.4 mm (0.25 in.) hex, 79% open Outer Dimensions (L x W): 190 x 100 mm (7.5 x 3.9 in.)
Efficiency (4π)	²³⁹Pu: 20%
Typical Background (10 µR/hr field)	3 cpm or less
Detector Uniformity	within 10% of average reading
Photomultiplier Tube	38 mm (1.5 in.) diameter
Operating Voltage	Typically 500 to 1000 V (1500 V max.)
Temperature Range	-20 to 50 °C (-4 to 122 °F)
Environmental Rating	IP rating of 63
Connector	Series "C" (others available)
Construction	Aluminum with beige powder coating
Size (H x W x L)	10 x 10 x 33 cm (4 x 4 x 12.25 in.)
Weight	0.68 kg (1.5 lb)

Related Products

Model 43-1

Model 43-2

Model 43-5

Model 43-65

Model 43-92

Model 43-136

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

(800) 622-0828 (US & Canada)
(325) 235-5494
(325) 235-4672

Directions to Facilities

International Contacts

Follow Us

© 2025 Ludlum Measurements, Inc.