 The paper describes the x-ray attenuation in materials according to their atomic number, using six different materials from low atomic number to higher atomic number, iron, Fe26, as low atomic number, silver, ageu-47, tin, Sn50, platinum, .78, gold, Le79, and lead, PB82, as high atomic number. Using the data were taken from the NIST standard reference database 126. From the J. Seltzer work, a table of contents was used. Whereas the mass attenuation coefficient for the above six elements was taken and compared with each other. This article was authored by V. Jamal Jalal, B. Mohamed Faraj and Sarkisela Abdul Karim.