This work pro poses a math e mat i cal func tion for de scrib ing the de pend ence of mass at ten u ation co ef fi cients vs. en ergy for com pos ite ma te ri als in the range of 100 keV to 2 MeV. The obtained re sults show that the pro posed func tion is ca pa ble of ac cu rately de scrib ing the data with a co ef fi cient of de ter mi na tion of ap prox i mately 1 for all in ves ti gated ma te ri als. Us ing the pro posed math e mat i cal func tion, the mass at ten u a tion co ef fi cients were in ter po lated and com pared with the re sults from the Monte Carlo sim u la tion. The re sults show good agreement when the sim u lated to in ter po lated mass at ten u a tion co ef fi cient ra tios are in the range from 0.95 to 1.05. More over, the val ues of in ter po lated mass at ten u a tion co ef fi cients have also been com pared with the ex per i men tal data in the pre vi ous works which in di cates that most of these ra tios range from 0.9 to 1.1.