(1) Nuclide Identification Number (ZAID). This number is used to identify theelement or nuclide desired. The form of the number is ZZZAAA.nnX, whereZZZ is the atomic number of the element or nuclide, AAA is the mass number of the nuclide, ignored for photons and electrons, nn is the cross-section evaluation identifier; if blank or zero, a default cross-section evaluation will be used,
and X is the class of data:
C is continuous energy; D is discrete reaction;
T is thermal;
Y is dosimetry;
P is photon;
E is electron;
and M is multigroup.
For naturally occurring elements, AAA=000. Thus ZAID=74182 represents the isotope W, and ZAID=74000 represents the element tungsten.
X 是截面数据库分类：C 表示连续能量的；D 表示离散反应的；T 是热群的；Y 是放射性测量的；P是光子的，E 是电子的；M 是多群的。[/post]
本贴转自52MC