注量率分布是球面源伽玛射线强度绝对测量的必需参数。通常使用的中心点公式只能用于探测器平面中心点注量率,而无法获得注量率分布。根据中心点公式,用微元法思想发展了一种计算任意点注量率的数值方法——Trueflux。计算表明:对中心点,Trueflux与中心点公式一致;对任意点,Trueflux与MonteCarlo通用程序MCNP的结果在3%以内符合。因此,Trueflux是一种计算任意点注量率的有效方法。 The fluence rate distribution is an essential parameter for absolute measurement of the gamma ray intensity of the spherical source. The commonly used center point formula can only be used for the detector center-of-plane fluence rate, but not for the fluence rate distribution. According to the center point formula, a numerical method for calculating the arbitrary point fluence rate is developed by using the method of micromorphology - Trueflux. Computation shows that Trueflux is consistent with the center point formula for the center point, and Trueflux and MonteCarlo common program MCNP results are within 3% for any point. Therefore, Trueflux is an efficient way to calculate any point fluence rate.