TCP and Dose
Many thanks to FG and Iomp; informative and useful posts.
I appreciate that a reduction of TCPs et al contamination to zero is indeed impracticable for all the reasons given.
The solution to the problem in the here and now is, in part, going to involve TCP dose calculations and risk assessments to run in parallel with the search for engineering improvements
Such dose calcs bring in several factors; toxicity, concentration and time to name but three.
I doubt that there is (i) that much precise data to hand and (ii) an exact alogrithm to run it on and it's dangerous to make a sweeping statement as I'm sure I did at the end of my last post.
We perhaps need to exert firm pressure to collect better data.
But .......intuition/common sense says that SLF like me are going to be at a generally lower statistical level of risk than all types of crew and that was the point I was trying to make previously - badly!
CW