Alpha, beta and gamma radioactive aerosol continuous sampling and measuring device

Abstract

The invention relates to an alpha, beta and gamma radioactive aerosol continuous sampling and measuring device which comprises a frame, a sampling chamber, a measuring chamber, a boosting motor, a tape conveying motor, a tape collection plate, a tape feeding plate, a filter paper tape, a passivated ion implantation plane silicon detector and a sodium iodide detector. The sampling chamber comprises an upper air chamber and a lower air chamber, and the upper air chamber and the lower air chamber are communicated with each other; the top of the upper air chamber is provided with an air inlet, and the bottom of the lower air chamber is provided with an air outlet; the measuring chamber comprises an upper measuring chamber and a lower measuring chamber, and the upper measuring chamber and the lower measuring chamber are communicated with each other; an output end of the boosting motor is connected with an eccentric shaft through a speed reducer, and the eccentric shaft is connected with both the upper air chamber and the upper measuring chamber through a connecting rod; the tape conveying motor is arranged on one side, close to the measuring chamber, of the frame; the tape collection plate is connected with the tape conveying motor through a speed reducer; the tape feeding plate is arranged on the other side of the frame; one end of the filter paper tape is wound on the tape feeding plate, and the other end of the filter paper tape sequentially penetrates between the upper air chamber and the lower air chamber and between the upper measuring chamber and the lower measuring chamber and then are wound on the tape collection plate; the passivated ion implantation plane silicon detector is arranged at the bottom of the upper measuring chamber; the sodium iodide detector is arranged in the lower measuring chamber.

Description

technical field [0001] The invention relates to a sampling and measuring device, in particular to a continuous sampling and measuring device for alpha, beta and gamma radioactive aerosols. Background technique [0002] Radioactive aerosol monitoring is an important part of nuclear environmental protection. With the development of nuclear energy, radioactive substances may be released during the operation of nuclear power plants and the reprocessing of nuclear fuel. In the event of fuel element damage or a nuclear accident, there are three types of radioactive substances released: (1) γ radionuclides─ 131 I. 137 Cs, 134 Cs, etc.; (2) alpha radionuclides─ 239 Pu, 235 U, etc.; (3) β radionuclide─ 90 Sr, 89 Sr. These nuclides are often released into the atmosphere in aerosol or gaseous form. In some cases, these radioactive materials co-exist in the atmosphere, so instruments that can measure these radioactive aerosols simultaneously are needed. [0003] At present, th...

AI Technical Summary

Problems solved by technology

However, it only assembles several detectors, including PIPS, NaI(Tl), and HPGe detectors, in a lead chamber, samples the aerosol samples collected by filter paper, and sends them to each detector in turn for measurement by a manipulator. Passivated ion implanted planar silicon) detectors measure α and β aerosol concentrations, and NaI(Tl) (sodium iodide) or HPGe (high-purity germanium) detectors measure γ aerosol concentrations. Sol concentration

In addition, the instrument is bulky and expensive, which is unaffordable for ordinary users.

Images