One thing that spins my head around is the sheer number of different units related to radiation and radioactivity. I can't keep the damn things straight. Milli

One thing that spins my head around is the sheer number of different units related to radiation and radioactivity. I can't keep the damn things straight. Millisieverts and becquerels and curies. Rads, rems, grays. Roentgens! (NG,NT) Whenever I see a pop-sci article or video relating to radiation, it feels like one unit is chosen at random. I know this isn't the case. Each one measures a different thing. And of course we have to have a pair of competing units for each thing because that's how we do all other units. I had to go look all those units up before writing this comment.