[Billthedrill]

There is no "plutonium-238." U-238 (Uranium) is the naturally-occurring form and is not weapons-grade. Plutonium's atomic number is 244.

[VMI70]

There is no "plutonium-238."

Ummmm

http://ourworld.compuserve.com/homepages/d1v/pu238.htm

[miliantnutcase]

It is a manufactured material-like the previous post indicates

[2ndreconmarine]

There is no "plutonium-238." U-238 (Uranium) is the naturally-occurring form and is not weapons-grade. Plutonium's atomic number is 244.

In short. Wrong.

The atomic number of Pu is 94. The atomic mass of Pu varies from 239 to 242. The type of Pu used in bombs (called weapons grade) is mostly Pu-239.

Pu-238 is used as a heat source. Typically for satellite power systems.