The Forward Method Research Of The Exposure Rate Of Aviation γ Spectrum

At present in both Chinese and foreign aviation gamma spectrometer, mainly uses in measuring high feature gamma spectra period of eminence inverse underground radionuclide content, through the measurement data of the form of geological ore is discussed. In addition, the aviation gamma spectrometer, high effect and measurement of calibration, is also discussed. This is a certain extent in the aviation gamma spectrometer measurement for work.The main purpose of this thesis is based on theoretical and experimental study and establish the typical significance of gamma ray radiation body of the mathematical model of eminence, gamma ray radiation body above the eminence attributions of theoretical basis.According to the different height gamma rays eminence in the body with the earth radiation between the content of radioactive elements are problems, from the rays through the following material attenuation rules of using theoretical derivation method, and finally establish the patch, linear, belt, planar body, infinite general source of gamma radiation body above eminence with space of mathematical model. In order to establish various radiators of inspection of eminence changes over the mathematical model, using the monte carlo simulation method was tested. For a typical significance of radiation (pointlike source, linear source, the ribbon source and shape etc) different height gamma rays of the original spectrum and variation, and the characteristics of photonic energy eminence of theoretic calculation model.The main conclusions of this study include:1, Through the mathematical equation modeling study, established a typical significance of radiation (linear source, planar sources, infinite source, the belt in the source) above the gamma rays eminence mathematical model.2, Through the monte carlo simulation computation, blob-shaped source, linear source of gamma rays with high count-rate trend and the results of theoretical formula calculate that is consistent with the establishment of mathematical model, we are correct and reliable.3, Blob-shaped had monte carlo simulation computation and source of the theoretical formula calculate, gamma rays to 90m high count-rate of high count-rate of about 10m count-rate 1%.4, Linear source after monte carlo simulation calculation and theoretical calculation formula of gamma rays, the result is high count-rate to 90m near-gamma gamma rate of about 10m high count-rate 7%.5, The theoretical calculation and monte carlo simulation each radiation (non-point source, belt, linear source and surface source (above) gamma-ray counting the relative rate of change with the trend of high attenuation curve, can get to the conclusion is consistent, the acquisition of the aviation gamma spectrometer data not only by the ground radionuclide content, high effect, but also by the shape of radiators.6, The acquisition of the aviation gamma spectrometer data not only by the ground radionuclide content, high effect, but also by the shape of radiatorsThis work has different characteristics of air gamma radiation above the body energy eminence modeling, establish practical mathematical model of inverse u-shaped accurate geological medium, K content, Th.