While reading this I was thinking it would be interesting to see an infographic which showed the relative size/mass you would need of various isotopes to detect

While reading this I was thinking it would be interesting to see an infographic which showed the relative size/mass you would need of various isotopes to detect, say, 500 msv/hr in open air at a fixed distance. Since most people never see radioactive substances, it could be interesting to compare them visually.