Those old demo meters are really useful.

Nice one Eugene. Wishing you every success in your new role.

Very true.

Thanks for sharing. This seems like a great idea. Couldn't find out what isotopes they are using, so they are probably keeping that confidential.
Will let my students know about this application when I am teaching radioactivity next term.

Looking forward to reading this. Couldn't resist that offer.

I was given a Kindle for Christmas last year. Was initially reluctant to give up physical books but I enjoy using it and now wouldn't be without it.