Yes, CLL is radiogenic, according to the latest research.

"Radiation and the Risk of Chronic Lymphocytic and Other Leukemias among Chornobyl Cleanup Workers",

Principal researcher, Lydia B. Zablotska MD, PhD

And recent Coal miner research results.

And according to Hematology Times

Bill Duff

When it was first created - in stars during the very early stages of the universe.

Because Neptune does have a heat source. It generates about 2.6 times more energy that it receives from the Sun. This may be due to radiogenic heating [See related link] but we're not too sure.

There are different methods for dating different types of rocks.

The most common and usually precise way of dating a rock (or more precisely, the minerals within a rock) is by using radiogenic dating methods. Some isotopes of some elements, like uranium, are radioactive. They decay to form a daughter product (uranium > Lead) at speeds according to their half lives. By measuring the proportion of daughter to parent in a sample, using a mass spectrometer, the age of the mineral can be found.

It is important to note that a radiogenic age is the age of the time the mineral "closed". This refers to the point at which the mineral was cool enough that it could no longer exchange atoms with its surroundings. If a mineral is brought above its closing temperature after its formation, it will re equilibrate, and the radiogenic signature of its age will be erased and brought back to zero (if full equilibration with surrounds occurred)

Sedimentary rocks can be dated using fossil material, as some fossils are known from specific times in the geological record, known as "index fossils".

The interaction of solar radiation with minerals can create what are called cosmogenic nucleotides. Once a mineral grain is buried, it stops forming nucleotides. Measuring the level of nucleotides can give an age of burial, which is useful in dating some regolith material.

There are some very deep sources of radiogenic heat with geothermal power potential, like the Cooper Basin in Australia which lies 4.2 kilometres or over 2.5 miles underground. In other places in the world heat is harvested very close to the surface like The Geysers, a geothermal field in California.