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LOW LEVEL α/β COUNTING SYSTEM

MODE CLB-101（Single channel system） MODE CLB-102（2 channels system） MODE CLB-104（4 channels system） A series of low level α/β counting system have been developed and can be supplied to users now. The flow counter tube (proportional counter chamber) and the guard tube are specially designed. The thin window of the measure tube is up to 2μm and window size gets to Ø60mm, so it has larger efficiency and lower energy α/β particle can be detected. A cap type guard tube and a lead shied chamber are designed do decrease background. The system is PC controlled, and the windows software is very convenient to users. It is one of the best low-level instruments in the world. Application of the Instrument: The instrument is employed in the entire field of radiation protection for measurement of simultaneous α and β radiation in water, air, soil, ore and foods et al.

Characteristics:
1.Newest computer and electron technique has been used in the instrument; both the strong ability and user’s friendly interface are convenient to users.
2.A diameter Ø60mm and thickness 2μm counter window is designed, so it has a large measurement area, larger efficiency and lower energy α/β particle can be detected. The detect efficiency >40% to ¹⁴C β particle, the detect efficiency >80% to ²⁴¹Am α particle. The instrument even could be used to measure radiation of 3H.

3.The advanced methods and skills for data processing are applied; many works can be performed automatically, as well as measurement of normal samples, HV control, output report, measurement and display of plateau curves.
4.The flow counter tube has a good characteristic: The plateau length>100V and slope<2.5% for ¹⁴C measurement. For X-ray produced by ⁵⁵Fe or 3H the plateau length>300V and slope<2.0%. The plateau length>300V to ²⁴¹Am α-particle.
5.The device can automatically differentiate α and β particles: Spillover (α to β): <1.0%(²¹⁰Po) Spillover (β to α): <0.1%(⁹⁰Sr^-90Y)
6.Instrument α background ≤0.0017cm^-2min^-1, β background ≤0.0354 cm^-2min^-1, and the backgrounds can be subtracted automatically by software.
7.The instrument has full functions for different applications and works stably. The instrument has been used in The 9th Institute of Nuclear Science and The Bang fu Sanitation and Anti-epidemic Station for a long time, in fact the abilities are better then the given specifications.
8.A entire set of standard radio-source can be supplied.

Comparison between this instrument and other instruments:

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