NONSENSE GAS error

Geometry and Materials
1

Dear FLUKA users,

I’m trying to define a target material for H218O like the attached input.
I get an error saying “NONSENSE GAS”.

As the manual says, I didn’t define it as [MAT-PROP] because the density of target is not even below 0.01.
The previous research defined it as [LOW-MAT], so I defined it as O-16 material in my input because of the low energy neutrons.
However, the error remains the same and is not running.

Also, I’m wondering if I’m doing something wrong for non-natural isotopes like O-18.

Test.inp (2.4 KB)

Thank you,
Best regards

2

Your COMPOUND definition is wrong, since it’s given as mass fraction instead of atom relative content (as intended, I guess).
Also, remove the LOW-MAT card, which is made obsolete by the neutron point-wise treatment.