This happens if the isotope’s mass number (which is an integer!) is not input in the dedicated WHAT(6) of the MATERIAL card. Remember also to leave empty WHAT(2) and WHAT(4), as recommended in the manual.
This happens if the isotope’s mass number (which is an integer!) is not input in the dedicated WHAT(6) of the MATERIAL card. Remember also to leave empty WHAT(2) and WHAT(4), as recommended in the manual.