Radionuclides occur suddenly anytime and everywhere, but unfortunately they are largely unknown. This is because we have no sense organ for them and cannot perceive them.
The big difference:
they are kind of mini "projectiles" - not radiation!
Radionuclides are particles and must not be confused with radioactive radiation or radioactivity. When they enter the body, they bombard cells and organs - the result is various types of cancer in different parts of the body.
These radionuclides occur temporarily as low-flying, completely invisible kind of clouds. They are spread by wind and weather. They can pass by quickly, but also settle down stationary. Both are detected immediately by our protection system with an alarm or all-clear signal. Because these cancer triggers appear just as sporadically and unpredictably "like rain showers" suddenly, the permanent scanning is so extremely important.
They are unimaginably tiny particles (atoms) which permanently emit extremely dangerous energy impulses. From the small brown spot in the middle, per second 300,000 "projectiles" are emitted which are extremely destructive in living organisms. They can occur everywhere in our environment. These particles are not perceptible. We have no sense organ for it. Cancer - much later - shows, that they entered the body.
Radionuclides are dangerous particles, which are distributed in the air by wind and weather. In our country alone, a gigantic number of radionuclides escape from technical facilities alone during the normal operation:
Every single radionuclide can become a cancer trigger.
These quantities are known and accepted by the authorities.
When ignorance has terrible consequences -
what nobody knows and why this cancer risk is so enormous:
The radioactive radiation of radionuclides in this building rubble is not very dangerous in a distance of some few meters. That is why this building rubble is declared by the authorities as "harmless". But as this rubble is still radioactive - there must be radioactive particles (= radionuclides) within the rubble in large quantities.
If these radionuclides - which are contained in huge quantities in this as "harmless" declared building rubble - escape into the air and the environment by wind and weather, they can be incorporated by humans.
This is how the "unknown" cancer cases are generated.
Although gigantic quantities of these dangerous radionuclides are constantly being released into the environment from various sources, this is kept quiet. This is easy because we have no way of perceiving this enormous threat.
We have no sense organ for it.
We are running blindly into the cancer catastrophe - 500,000 people per year.