I'd rather be near a well maintained nuclear weapon than near one of the Cobalt sources...
Not confined to the campuses, unfortunately. Don't go near scrapyards: https://en.wikipedia.org/wiki/Cobalt-60#Incidents_involving_medical_radiation_sources
TE too. A lot of 30's-60's aircraft instruments and some TE meters were luminised with Radium based paint Some radio's, notably the "19 Set" were as well. A lot of surplus meters got into hombrew TE. Thee are no longer luminous but still rdioactive. They also tend to leak Radon and the leaves decay products on nearby items. They can often be identified visually. The radioactive paint is typically a yellow/brown colour like it's nicotine stained. Often only the needle and significant value / marks are luminised. Another use of radium is in some humidity meters, notably the "Dewpointer"
t's not just Radium, Tritium and Ni63 is also found in instruments that rely on ionisation. An example is the 3M model 703 static field meter. These csn be found on ebay e.g.
www.ebay.co.uk/itm/124461079391? but should not be. Apart from being against ebay rules, in the USA this instrument is subject to an NRC general licence and is not transferrable. If you don't use it any more or it is faulty it has to be returned to 3M (or a licenced disposal site but they will charge $$$). I have a 703, differernt rules here.