Keyword:SSFCHOOSE

SSFCHOOSE ncho {0} nprint {0}
sym(j), j=1,ncho

---

This keyword is used to specify the nuclides for which the self-shielding factors are computed using the probability table data. 'ncho gives the number of element or nuclide names that follow the keyword. The symbols sym may either be element names (e.g., Ti) or nuclide names (e.g., W182). If an element name is given, then all the naturally occurring isotopes of that element are included in the list of nuclides to which the self-shielding correction is to be applied.

nprint is by default 0, in which case it prints the list of probability table data files and the nuclide mixture. If it is set to 1, then it additionally prints total and partial cross-sections and dilutions versus energy bin for all the nuclides to which self-shielding is being applied.

Example usage where self-shielding is applied to isotopically-defined tungsten, using SSFFUEL and with self-shielding options selected with PROBTABLE:

< -- Control phase -- >
...
GETXS 1 709
PROBTAB 1 0
SSFCHOOSE 4 0
 W182 W183 W184 W186
SSFFUEL 4
 W182 1.34834187E+22
 W183 7.27597094E+21
 W184 1.55899050E+22
 W186 1.44654079E+22
FISPACT
* COLLAPSE tal-n/gxs-709 with tp-709-294
< -- Initial phase -- > 
...
< -- Inventory phase -- > 
...