<220>Rn measurement method and device based on time spectrum analysis

A measurement method and a technology of a measurement device, which are applied in the direction of measurement devices, material analysis, and material analysis using wave/particle radiation, etc., can solve problems such as difficulty in accurate measurement, insufficient miniaturization and intelligence of instruments, and short half-life, so as to achieve improvement Measurement efficiency, ease of field work, and miniaturization

Active Publication Date: 2012-09-12
NANHUA UNIV
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Problems solved by technology

because 220 The half-life of Rn is very short, and the existing measurement techniques and calibration methods are not perfect enough
Especially at 222 Rn/ 220 Rn mixed case, 222 Rn, 220 Mutual interference between Rn causes 222 Rn/ 220 The problem of Rn measurement error has not been fully resolved
Although there are some commercial radon measuring instruments on the market (such as RAD-7 of Durridge Company of the United States and RTM2100 of SARAD Company of Germany, etc.) 222 Rn, 220 The screening measurement of Rn gas, but most of the

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  • &lt;220&gt;Rn measurement method and device based on time spectrum analysis
  • &lt;220&gt;Rn measurement method and device based on time spectrum analysis
  • &lt;220&gt;Rn measurement method and device based on time spectrum analysis

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[0016] A time-spectral analysis 220 The Rn measurement method uses the decay time characteristics of radon isotopes to construct a coincidence-delay time spectrum for the nuclear pulse time. 220 Rn- 216 Po coincidences are differentiated from accidental coincidences of background and other radiation, up to the measurement 220 The purpose of Rn concentration, its specific measurement method is as follows:

[0017] A. Constructing time spectrum: Construct a time spectrum for the recorded nuclear pulse time list, and compare the time interval of 3s after each pulse time (20 times 216 Po half-life) 220 Rn and 216 Time distribution of alpha pulses of Po. The first pulse time is used as the start time, and the time interval of each pulse after that is compared with 3s. If it is less than 3s, it is considered a coincidence event until the time interval is greater than 3s; then the second pulse time is used as the next start time, also compared to 3s. By analogy, using each pul...

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Abstract

The invention provides a <220>Rn measurement method and device based on time spectrum analysis. According to the <220>Rn measurement method, a decay time spectrum is established for nuclear pulse time by using a decay time characteristic of a radon isotope, so that <220>Rn-<216>Po coincidence is distinguished from stray coincidence of a background and other radiations, and the purpose of measuring <220>Rn concentration is realized. The <220>Rn measurement device based on the time spectrum analysis, which is used by the method, consists of a microprocessor, a pulse shaper, a small keyboard, an LED (Light-Emitting Diode) display unit, a communication port and a power source; the pulse shaper is connected with the microprocessor through a cable; the small keyboard is connected with the microprocessor through a cable; the LED display unit is connected with the microprocessor through a cable; the communication port is connected with the microprocessor through a cable; and the power source is connected with the microprocessor through a cable.

Description

technical field [0001] The design of the present invention relates to a 220 Rn measurement method and device, especially a method based on time spectrum analysis 220 Rn measuring method and device. Background technique [0002] Radon is one of the main sources of natural radiation that humans are exposed to. In recent years, it has been discovered that it has been neglected in the past 220 The exposure of Rn (thoron) to humans is much higher than estimated in the past; 232 The Th content is 1.6 times the world average, which makes it possible to measure and investigate the 220 Rn has become a new focus of radiation protection at home and abroad in recent years. evaluate 220 When the radiation dose to the public caused by Rn and its progeny is accurately measured 220 Rn concentration is the key. because 220 The half-life of Rn is very short, and the existing measurement techniques and calibration methods are not perfect enough. Especially at 222 Rn / 220 Rn mixed ca...

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Application Information

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IPC IPC(8): G01N23/00
Inventor 颜拥军周剑良黄德荣赖伟杨朝桐
Owner NANHUA UNIV
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