Off topic, but interesting story.
There is a military base not far from where I live and they have (or had) a cesium 137 source that was so hot it was stored in a lead source pig that was 16'x16'x16' buried several stories underground, according to a friend of mine who is a retired military radioactive expert from this base. Now, back in the day this particular base was world renowned as a chemical and biological military research facility used by Canada, Britain, Germany and NATO. According to my retired friend, the only purpose of this cesium was to kill produced biological warfare agents after they were done with the research and testing by exposing them to the extreme radiation of the cesium. I have no idea how many Curies this source was but cesium 137 has a half life of just over 30 years.