BF₃ Proportional Counters

Name: BF₃ Proportional Counters
Brand: Exosens

Precise, high-efficiency thermal neutron detection with outstanding gamma discrimination and long operational life.

High Neutron Detection Efficiency

Excellent Gamma Discrimination

Long Operational Life

BF₃ Proportional Counters

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Technical information

	³He	BF₃	Boron-Lined
Neutron Reaction	³He(n,p)³H	¹⁰B(n,α)⁷Li	¹⁰B(n,α)⁷Li
Reaction Energy (MeV)	0.764	2.4 / 2.8	2.4 / 2.8
Gamma Discrimination	Good	Excellent	Excellent
Application Fit	High Sensitivity, Spectroscopy	Flux Monitoring, Harsh Environment	Flux Monitoring, General Detection

Basic Type	External Diameter (mm)	Active Length (mm)	Gas Pressure (atm)	Typical Operational Voltage (V)	Neutron Sensitivity (cps/nv)
28EB/20/13	12.5	280	0.26	930	0.8
45EB/160/25	25.4	455	2.11	3100	35
25EB/20/50	50.8	250	0.26	1975	12
50EB/40/50	50.8	500	0.53	2695	44

Description

Exosens’ BF₃ Proportional Counters are engineered for high-efficiency thermal neutron detection with excellent gamma discrimination, making them ideal for use in both instrumentation systems and experimental applications. Utilizing the ¹⁰B(n,α)⁷Li reaction within a boron trifluoride gas fill, these detectors deliver consistent, low-background performance across a wide range of neutron flux levels. Their robust aluminum or metal construction, thin-walled design, and optimized gas multiplication (typically around 40) ensure reliable sensitivity and long operational life—exceeding 10¹⁷ nvt (n.cm-2) in many cases.

These counters are available in various configurations and gas fills (natural or enriched BF₃) and can be customized to meet specific pressure, length, and connector requirements. Whether deployed in collimated beam setups or under full irradiation conditions, Exosens’ BF₃ counters provide dependable, adaptable solutions for precise neutron monitoring in nuclear research and safety-critical environments.