In a way radioactivity is one of the easiest contaminants to deal with: Instant, contact-free testing for levels is trivial with cheap, handheld devices, compar

In a way radioactivity is one of the easiest contaminants to deal with: Instant, contact-free testing for levels is trivial with cheap, handheld devices, compared to virtually all other toxic substances which usually require taking samples and analyzing them in a lab. Decay is very well understood and easy to characterize.