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I assume you mean ionizing electromagnetic radiation.
Cathode ray tube televisions (i.e. the non-flatscreen televisions) and some other electric devices produce some radiation.
While it might sound pretty excessive all these sources add up to a very small amount of radiation. About 2.4 mSv.
Most additional radiation people receive are from medical imaging methods such as a CT-scan (20 mSv)
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Are all the elements naturally occurring manmade or both?
Not all the elements occur naturally; some elements are man-made.
Is zircon manmade?
Zircon itself is a naturally occurring mineral, so it is not manmade. However, some zircon gemstones undergo treatments, such as heat treatment, to enhance their color or clarity, but the base mineral itself is natural.
Can a natural isotope be radioactive?
Yes, a natural isotope can be radioactive. Some natural isotopes have unstable nuclei and undergo radioactive decay to achieve a more stable form. This process involves the emission of radiation in the form of alpha particles, beta particles, or gamma rays.
Which elements found in nature have mainly radioactive isotopes?
Some elements found in nature that mainly have radioactive isotopes include uranium, thorium, and potassium. These elements have naturally occurring radioactive isotopes that decay over time, releasing energy in the form of radiation.
Why do we say that some elements aren't naturally occurring?
Some elements are not naturally occurring because they are created in laboratories through nuclear reactions or particle accelerators. These synthetic elements do not have stable isotopes and decay rapidly, making them difficult to find in nature. Examples include elements beyond uranium on the periodic table.
