Device and method for realizing high sensitivity detection on radioactive gas nuclide activity

Abstract

The invention discloses a device and a method for realizing high sensitivity detection on radioactive gas nuclide activity and solves a problem that cosmic rays generate coincidence background counting in a coincidence measurement system. The device comprises an inflatable beta detector, a gamma detector, an anti cosmic ray detector set and a digital coincidence circuit, wherein the beta detector and the gamma detector are arranged in a lead shield, the beta detector is arranged on the gamma detector in a bottom down mode, the anti cosmic ray detector set is used for shielding coincidence signals generated by the cosmic rays in the beta detector and the gamma detector, the anti cosmic ray detector set comprises five anti cosmic ray detectors which are respectively arranged at a top portion and periphery of the lead shield, output signals of the anti cosmic ray detectors, output signals of the beta detector and output signals of the gamma detector are respectively transmitted to the digital coincidence circuit to acquire gamma detector original spectra, anti cosmic ray gamma spectra, beta-gamma coincidence spectra and anti cosmic ray beta-gamma coincidence spectra. The device is advantaged in that radioactive gas nuclide detection sensitivity can be greatly improved.

Description

technical field [0001] The invention relates to a device and method for highly sensitive detection of radioactive gas nuclide activity, which can greatly improve the detection sensitivity of radioactive gas nuclide. Background technique [0002] High-sensitivity detection of radioactive gas activity is of great significance to the monitoring of radioactivity in the atmospheric environment. The literature "Measurement method of radioactive xenon isotope activity in xenon sample of CTBT noble gas" (Nuclear Electronics and Detection Technology, 2011, Volume 31, Issue 2) introduces the use of plastic scintillator β detector and NaI(Tl)γ detector It conforms to the method of measuring the activity of xenon isotopes, but due to the poor energy resolution of NaI(Tl) detectors, the energy is easy to drift with temperature and other shortcomings, which makes the isotopes in the sample interfere with each other, resulting in the decrease of detection sensitivity and accuracy. Weak re...

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Problems solved by technology

The literature "Measurement method of radioactive xenon isotope activity in xenon sample of CTBT noble gas" (Nuclear Electronics and Detection Technology, 2011, Volume 31, Issue 2) introduces the use of plastic scintillator β detector and NaI(Tl)γ detector It conforms to the method of measuring the activity of xenon isotopes, but due to the poor energy resolution of NaI(Tl) detectors, the energy is easy to drift with temperature and other shortcomings, which makes the isotopes in the sample interfere with each other, resulting in the decrease of detection sensitivity and accuracy. Weak recognition ability

The patent "A Method and Device for Measuring Trace Radioactive Gas Nuclide Activity" introduces a method for measuring the activity of radioactive gas samples using plastic scintillator β detectors and HPGe γ detectors, which solves the problem of xenon isotope interference and improves gas The accuracy and sensitivity of the sample activity measurement, however, increases due to cosmic rays that simultaneously generate counts in the plastic scintillator beta detector and the HPGe gamma detector, thus increasing coincident spectral background

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