The invention discloses a high-sensitivity alpha
energy spectrum measuring method of
radon concentration in air by using a
radon and
daughter collecting device, an alpha
ray semi-conductive
detector, a temperature and
humidity measuring module, a circuit
system, a man-computer interface and a
computer data analysis system. The sensitivity surface of the alpha
ray semi-conductive
detector is arranged in a cavity of the
radon and
daughter collecting device, and the alpha
ray semi-conductive
detector, the temperature and
humidity measuring module and the man-computer interface are connected with the circuit
system which is connected with the
computer data analysis system through a
USB (Universal Serial
Bus) interface. The method collects radon in the air by adopting a static
diffusion mode, absorbs radon charged daughters by adopting a high-pressure electrostatic mode, distinguishes radon-
thorium daughters by utilizing the alpha ray semi-conductive detector to measure air radon concentration through alpha
energy spectrum measurement and correct influence on the measurement of radon concentration by adopting a temperature-
humidity synchronous measuring mode. The method is suitable for the fields of monitoring radon level and controlling
pollution in the indoor
radiation environment of civil constructional
engineering, monitoring radon concentration in mines and tunnels, and the like.