Radium produces the most radiation by miles. The plutonium gives off some alpha radiation that won’t hurt you if you don’t eat it. (Eye protection would be a good idea I suppose.) I don’t remember what U-235 emits but I don’t think it’s a huge amount.
The half-life of 235U is hundreds of millions of years so it is not a concern. However, it will literally become a nuke if too much (a few liters or 60 kg) get too close together.
The half-life of plutonium-239 is tens of thousands of years so only a thousandth will get a chance to hurt Theodore over his lifetime. However, it is probably chemically toxic so it might cause non-radiation poisoning.
Radium-225 will decay in days, and will quickly go through 7 more radioactive reactions, both alpha and beta, before becoming essentially stable bismuth. It is the worst by far.
Radium produces the most radiation by miles. The plutonium gives off some alpha radiation that won’t hurt you if you don’t eat it. (Eye protection would be a good idea I suppose.) I don’t remember what U-235 emits but I don’t think it’s a huge amount.
The half-life of 235U is hundreds of millions of years so it is not a concern. However, it will literally become a nuke if too much (a few liters or 60 kg) get too close together.
The half-life of plutonium-239 is tens of thousands of years so only a thousandth will get a chance to hurt Theodore over his lifetime. However, it is probably chemically toxic so it might cause non-radiation poisoning.
Radium-225 will decay in days, and will quickly go through 7 more radioactive reactions, both alpha and beta, before becoming essentially stable bismuth. It is the worst by far.