Ludlum Model 43-68

  Alpha Beta Radiation Gas Proportional Detector - 100 cm²

Introduction

The Ludlum Model 43-68 is a 100 cm² large area gas proportional alpha beta radiation detector for use in simultaneous alpha beta radiation surveys as well as alpha radiation or beta radiation surveys.

Specifications

PART NUMBER: 47-2005

INDICATED USE: Alpha beta radiation survey
RECOMMENDED COUNTING GAS: P-10 (10% methane, 90% argon)
GAS RECHARGE: Will operate on a static charge for over 15 hours with a 39" cable
WINDOW: Typically 0.8 mg/cm² aluminized mylar (other thickness available)
WINDOW AREA:
     Active - 126 cm²
     Open - 100 cm²
EFFICIENCY (4pi geometry): Typically 20% - ²³⁹Pu; 30% - ⁹⁹Tc; 15% - ¹⁴C; less than 1% - gamma
BACKGROUND:
     Alpha - Less than 5 cpm (when operating on the alpha only plateau region)
     Beta - Typically 400 cpm or less (10 microR/hr field)
COMPATIBLE INSTRUMENTS: Model 12, Model 16, Model 18, Model 2000, Model 2200, Model 2221, Model 2224-1, Model 2350-1, Model 2360
OPERATING VOLTAGE:
     Alpha - Typically 1000 - 1500 volts   
     Beta/Gamma - Typically 1600 - 1800 volts
COUNTER THRESHOLD SETTING: Typically 2 - 5 mV
GAS CONNECTORS: Double end quick disconnect
CONNECTOR: Series "C" (others available)
CONSTRUCTION: Anodized aluminum housing
TEMPERATURE RANGE: -4° F(-20° C) to 122° F(50° C)
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
SIZE: 3.9"(10cm)H X 4.6"(11.7cm)W X 7.8"(19.8cm)L
WEIGHT: 2 lbs (0.9kg)  

Replacement Parts

• Mylar Window

• Protective Screen

• Gas Fittings

• Electrodes

• 2-stage Regulator (Part Number: 2310017)

• Regulator Output Fitting - 1/4” FPT to ¼” tube (Part Number: 13-7836)

• Plastic Fitting Nuts for ¼” vinyl tubing (Part Number: 22-9689)

• Fittings for Flowmeter - 1/8” MPT to ¼” tubing (Part Number: 22-9522)

• 10 to 100 cc Flowmeter - 1/8" MPT to 1/4" tubing (Part Number: 22-9547)

• x feet ¼” OD Vinyl Tubing for gas supply and return (Part Number: 22-9514)

Technical Information

• Model 43-68 Data Sheet

• Model 43-68 Manual

Other Ludlum Products

• Other Ludlum Products

Ludlum Information

• Ludlum Introduction

• Ludlum Resources

• Ludlum Warranty

• Ludlum Repair and Calibration

• Ludlum Training