Single-nuclide air absorption dose rate measurement method based on numerical integration

The invention discloses a single-nuclide air absorption dose rate measurement method based on numerical integration. The single-nuclide air absorption dose rate measurement method comprises the following steps of: firstly, constructing a calculation expression of an air absorption dose rate theoretical value of a radioactive surface source at the central position of a detector by utilizing a numerical integration method; establishing an equation relationship between a G(E) function and a net counting rate in a characteristic gamma ray region of interest of the energy E; acquiring an expression of a G(E) function through simultaneous processing of two equations; aiming at a plurality of characteristic gamma rays with different energies, calculating a corresponding G(E) function value; fitting the energy E and G(E) function values by using a least square method to obtain a G(E) function curve; and during application, acquiring a G(E) function value from the G (E) function curve, and calculating an air absorptio