Alpha and beta particle activity detection device

Abstract

The present invention discloses an alpha and beta particle activity detection device which comprises a scintillating fiber bundle which comprises a plurality of spaced scintillating fibers, first and second photomultiplier tubes for receiving photons from the scintillating fibers and converting the photons into an electrical signal, first and second photomultiplier tube additional circuits for supplying power to the first and second photomultiplier tubes and amplifying an electrical signal, first and second output ends, and a sealing component. According to the device, the number of the photomultiplier tubes can be reduced, the volume of an overall detection system is reduced, the online measurement of total alpha and total beta activity in water is easily realized, the cost is low, the effective measurement area is large, and the online radioactivity measurement need of drinking water is satisfied.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to an α and β particle activity detection device. Background technique [0002] The national standard "Drinking Water Hygienic Standards" GB5749-2006 includes routine water quality indicators and limit values ​​including radioactive indicators, and gives guidance values ​​(non-limiting values): total α is less than 0.5Bq / L, total β is less than 1Bq / L . When the radioactivity index exceeds the guide value, nuclide analysis and evaluation should be carried out to judge whether it can be drunk, and the "reference index and limit value of drinking water quality" given by GB5749-2006 stipulates: the limit value of radium 226 and radium 228 It is 5pCi / L (0.18Bp / L), and the limit of radon is 300pCi / L (10.8Bq / L). [0003] In related technologies, the total α and total β detection of drinking water can be based on the "Drinking Water Standard Inspection Method" (GB5750.13-2006) using ...

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Problems solved by technology

However, the existing total α and β in drinking water are measured by using gold-silicon surface barriers, αβ double scintillation detectors, etc. after the sample is concentrated and prepared, but it cannot achieve online radioactivity measurement in drinking water. In general, the activity of radioactive substances in drinking water is extremely low, and the range of α and β rays is very short. Only α and β in water close to the detector can be detected. The lower limit of measurement of existing detectors is far away. Can not meet the requirements of online measurement

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