Flow type low background alpha beta measuring instrument

Main performance characteristics:

To reduce the background, a partitioned independent drawer design is adopted, with independent measurement channels. Each measurement channel is equipped with an independent main detector and independent electronics, and is equipped with a flow type anti coincidence detector. Samples can be changed separately, and different measurement times can be set according to the activity of the samples. Alternatively, when a certain measurement meets the requirements, the measurement can be independently terminated and replaced with the next sample to improve its efficiency.

The overall pneumatic system adopts parallel connection. If any of the detection systems fails during use, the other three systems are not affected and can perform analysis work normally.

■ Equipped with gas path protection function, the device stops counting after the gas is cut off.

Whether the sample is loaded properly and important components such as the ventilation outlet have prompt functions to quickly reflect whether they are working properly.

Ultra low background material is used, and 4 π shielding is adopted in the design of lead shielding. The overall shielding thickness reaches 10cm in all directions, and the thickness of a single lead block is ≥ 5cm. At the top of all detectors, a super large area coincidence detector is used to remove the influence of high-energy cosmic rays on the background count, further reducing the background level.

The replacement of detectors and detector windows can be directly completed by the front-end without any treatment of the lead bricks, making it convenient for daily maintenance and repair. At the same time, in terms of electronic maintenance, the same method is still used, without the need to handle faults from the back of the instrument.

Using genuine control and analysis software, data management adopts Microsoft Access database, which is simple and convenient;

Using serial communication to communicate with the host without losing data.

Equipped with QC function, it can freely set the counting measurement mode or MDA measurement mode, and all command and control data is stored in the Access database.

Multiple repeated measurement software directly obtains the average value and chi square test of multiple measurement results.

The software includes a series of standard report templates, which can output standard reports or customize report formats for users to output.

Main technical indicators:

detectorFlow type proportional counter: (size 5.7cm, detector window thickness: 80 μ g/cm2)

Background count: α ≤ 0.06CPM, β ≤ 0.7CPM (typical value)

Detection efficiency:Alpha source: 210Po ≥ 42%, 241Am ≥ 42%, 230Th ≥ 42% (4 π)

β源： 90Sr-90Y≥55%、99Tc≥43%，137Cs≥40%（4π）

Ping Slope and Ping Length:α: Ping slope<1.5%/100V, Ping length>1000V

β: Ping slope<2.5%/100V, Ping length>200V

Crossroad ratio;α to β<0.1%, β to α<0.1%

gas flow rateUsually set to 60cc/min, each unit includes a flow meter and knob, and usually the outlet of the pressure reducing valve

Pressure level 10psi

Power supply: AC 220V, 50-60Hz input

Ambient temperature0～40C

Relative humidity:≤90%