[roenxi]

I'd love to know how they got to 5/3. It also offers CPM to half-life conversion which has to be at least poorly labelled. That would imply that if two piles of different radioactive substances emit the same amount of radiation (obviously different masses in each pile) they have the same half life. That isn't the case, half life depends on what the substance is which is radiating, not the measured amount of radiation emitted.

[aw1621107]

Given their CPM to half-life conversion amounts to dividing by 60 (not to mention the nonsensical units), I'm not sure I'd place much faith in the website at all.