# Keyword:UNCTYPE

UNCTYPE iuncty {1}

This keyword allows the user to specify the type of uncertainty contributions to include when calculating the uncertainties of the radiological quantities. If iuncty is set to 1, or if the keyword is not used, then only the cross-section uncertainties are used in the calculation of uncertainties. This keyword is used in conjunction with UNCERTAINTY.

If iuncty = 2 then only the half-life uncertainties taken from the decay data library are used in the calculation of uncertainties.

If iuncty = 3 then both cross-section and half-life uncertainties are used.

Example usage to include both cross section and half-life uncertainties:

< -- Control phase -- >
...
FISPACT
* Title of the simulation
< -- Initial phase -- >
...
UNCERTAINTY 2
UNCTYPE 3
...
< -- Inventory phase -- >
...