Model 43-135-1

The Ludlum Model 43-135-1 is a large-area, 2π proportional detector designed for calibrating large-area alpha and beta sources. The windowless detector and source tray are sealed together via heavy duty clamps, which permit operating at higher pressures (up to 0.2 MPa).

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Model 43-1-1

Alpha-Beta Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 83 cm² (12.9 in²)
Efficiency:
- ²³⁹Pu : 30%
- ⁹⁰Sr/⁹⁰Y : 30%
- ¹⁴C : 4%

Model 43-2-2

Alpha-Beta Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 9.7 cm² (1.5 in²)
Efficiency:
- ²³⁹Pu : 25%
- ⁹⁰Sr/⁹⁰Y : 20%
- ¹⁴C : 5%

Model 43-65-2

Alpha-Beta Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 63 cm² (9.8 in²)
Efficiency:
- ²³⁰Th : 20%
- ²³⁹Pu : 20%
- ⁹⁹Tc : 15%
- ⁹⁰Sr/⁹⁰Y : 20%
- ¹⁴C : 1%

Model 43-89

Alpha-Beta Scintillation Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 63 cm² (9.8 in²)
Efficiency:
- ²³⁰Th : 20%
- ²³⁹Pu : 20%
- ⁹⁹Tc : 15%
- ⁹⁰Sr/⁹⁰Y : 20%
- ¹⁴C : 1%

Model 43-93

Alpha-Beta Scintillation Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 100 cm² (15.5 in²)
Efficiency:
- ²³⁹Pu : 20%
- ⁹⁹Tc : 15%
- ⁹⁰Sr/⁹⁰Y : 20%

Model 43-147

Alpha-Beta Scintillation Detector

Detector Type: ZnS(Ag) + Plastic Scintillator
Active Window Area: 200 cm² (31.0 in²)
Efficiency:
- ²³⁹Pu : 20%
- ⁹⁹Tc : 13%
- ⁹⁰Sr/⁹⁰Y : 20%

Model 43-68

Alpha-Beta Scintillation Detector

Detector Type: Rechargable Gas Proportional
Active Window Area: 126 cm² (19.5 in²)
Efficiency:
- ²³⁹Pu : 20%
- ¹⁴C : 15%
- ⁹⁹Tc : 30%
- ⁹⁰Sr/⁹⁰Y : 20%
- Gamma : 1%

Model 43-143-1

Alpha-Beta Detector

Detector Type: Gas Proportional
Active Window Area: 100 cm² (15.5 in²)
Efficiency:
- ²³⁹Pu : 20%
- ¹⁴C : 15%
- ⁹⁰Sr/⁹⁰Y : 20%
- Gamma: 1%