Powering spacecraft with solar energy may not seem like a challenge, given how intense the Sun’s light can feel on Earth.

For example, about 1.5 percent of a quantity of Uranium 238 will decay to lead every 100 million years. By measuring the ratio of lead to uranium in a rock sample, its age can be determined.

The activity concentration arising solely from the decay of the uranium isotopes (U-234, U-235 and U-238) found in natural uranium is 25.4 Bq per mg. In nature, uranium isotopes are typically found in ...

As scientists initiate the process of artificial nuclear decay, uranium-238 atoms absorb neutrons in the reactor core, becoming relatively more fissionable plutonium-239 atoms. When a plutonium ...

The rate of decay and type of radiation emitted vary for different ... SRS produced the Pu-239 from a combination of uranium-235 (U-235) and U-238 in the reactors. U-235 in this “fuel” released ...

There are three isotopes of uranium: U-238, U-235, and U-234. Uranium decays naturally, and highly active isotopes are now in short supply. Apparently, whatever process created the uranium on ...

The electrons released in beta-decay are of low energy ... It consists mostly of non-fissionable uranium-238, and is still somewhat radioactive, though less so due to most of the uranium-235 ...

The radioactive decay is expressed in units called becquerels ... For example, the half-life of Iodine 131 is eight days, but for Uranium 238, which is present in varying amounts all over the world, ...

For example, about 1.5 percent of a quantity of Uranium 238 will decay to lead every 100 million years. By measuring the ratio of lead to uranium in a rock sample, its age can be determined.