Since radioactive decay occurs in the nucleus of an atom, and temperature mostly has to do with atoms bouncing or vibrating against each other, I'd say that there would be no effect.
Maybe if you could get it down close to absolute zero, you might see a change in the behavior inside the nucleus.
Changes in physical properties: cooling is temperature decrease caused by heat exchange
The opposite of thermal expansion is thermal contraction, which refers to a decrease in size or volume of a material when it is cooled. This occurs because the particles within the material lose energy and move closer together, leading to a decrease in overall size.
When matter is heated, its particles gain energy and move more rapidly, leading to an increase in temperature and expansion of the material. Conversely, when matter is cooled, its particles lose energy and move more slowly, causing a decrease in temperature and contraction of the material.
Decrease
Conntraction
Chemical reactions and magnetic fields are not examples of thermal expansion. Thermal expansion specifically refers to the increase in size of a material when heated and the decrease in size when cooled.
The viscosity increase when the temperature decrease.
Cooled volcanic rock material
Particles vibrate faster when they are heated.
Lord Kelvin's estimate of the age of the Earth was based on the assumption that the planet was originally molten and gradually cooled over time. However, he was unaware of the phenomenon of radioactivity, which generates heat within the Earth's interior. This led to an underestimation of the Earth's age, as radioactive decay processes were not considered in his calculations.
It becomes igneous rock.
Radioactive waste will be managed through a combination of storage, treatment, and disposal methods. Low-level waste may be treated and then stored in licensed facilities, while high-level waste is typically cooled and stored in secure containers at nuclear plants before being transported to deep geological repositories for long-term disposal. Ongoing research is focused on improving waste management technologies and ensuring safety. Ultimately, the goal is to isolate radioactive materials from the environment for thousands of years until their radioactivity decreases to safe levels.