Hello Barry -

My guess - and this is simply a guess - is that once the neutron ratios have been adjusted for neutrons produced by decay of products created by direct radiation, Mars water inventory will turn out to be about half to one third of that set out earlier this year.

You have to remember that any water vapor high in Mars "atmosphere" would have been hit by enough radiation to split it into hydrogen and oxygen - and the hydrogen would most likely have almost immediately outgassed from the planet...

While that's still a lot of water, enough for life, the problem is that there are going to be a large number of isotopes with short half lifes - particularly of organic chemicals -

ep