Radiation and radioactivity are often mixed up. A matter like uranium can be radioactive. It means that it contains atoms that can emit radiations made of particules that travel away with great speed in the surroundings. These radiations may snatch electrons in the surroundings effects, which causes serious troubles in the target. But at the end of their path, they disappear as matter or are transformed into ordinary electrons, or harmless helium atoms. So there is no radioactive material in the target.

A radioactive matter is like an army. Its soldiers are dangerous, because they can fire and shoot bullets that may kill a victim. But after the shot, the bullet is not dangerous any more. After the shot, the soldier is still dangerous, but the victim is not.

Radiation is not "contagious". Radioactivity may be considered as "contagious" : radioactive substances may be transmitted from place to place, like an army that can move.

Radiation and radioactivity are often mixed up. A matter like uranium can be radioactive. It means that it contains atoms that can emit radiations made of particules that travel away with great speed in the surroundings. These radiations may snatch electrons in the surroundings, which cause serious troubles in the target. But at the end of their path, they disappear as matter or are transformed into ordinary electrons, or harmless helium atoms. So there is no radioactive material in the target.

A radioactive matter is like an army. Its soldiers are dangerous, because they can fire and shoot bullets that may kill a victim. But after the shot, the bullet is not dangerous any more. After the shot, the soldier is still dangerous, as he may shoot again, but the bullet and victim are not dangerous.

Radiation is not "contagious". Radioactivity may be considered as "contagious" : radioactive substances may be transmitted from place to place, like an army that can move.

A person who had touched a radioactive substance like uranium, may have absorbed some uranium atoms through the skin. This person becomes radioactive and then emits radiations. Apparently the Chernobyl firefighter has been irradiated when fighting the accident. He was touched by the radiation and became a victim of his duty during his job. But, bad luck, he had also the opportunity of touching some uranium from the exploding power station. And then, this uranium will stay on or in his body, and will emit radiation later on in the future. This person becomes radioactive, not because of the radiation he has received during his job, but because of the uranium that entered his body when he touched a piece made of uranium in the rubble of the power station. That is why nobody should touch him, because if this uranium is glued on the skin, it may be transmitted to somebody else.

Radiation and radioactivity are often mixed up. A matter like uranium can be radioactive. It means that it contains atoms that can emit radiations made of particules that travel away with great speed in the surroundings. These radiations may snatch electrons in the surroundings effects, which causes serious troubles in the target. But at the end of their path, they disappear as matter or are transformed into ordinary electrons, or harmless helium atoms. So there is no radioactive material in the target.

A radioactive matter is like an army. Its soldiers are dangerous, because they can fire and shoot bullets that may kill a victim. But after the shot, the bullet is not dangerous any more. After the shot, the soldier is still dangerous, but the victim is not.

Radiation and radioactivity are often mixed up. A matter like uranium can be radioactive. It means that it contains atoms that can emit radiations made of particules that travel away with great speed in the surroundings. These radiations may snatch electrons in the surroundings effects, which causes serious troubles in the target. But at the end of their path, they disappear as matter or are transformed into ordinary electrons, or harmless helium atoms. So there is no radioactive material in the target.

A radioactive matter is like an army. Its soldiers are dangerous, because they can fire and shoot bullets that may kill a victim. But after the shot, the bullet is not dangerous any more. After the shot, the soldier is still dangerous, but the victim is not.

Radiation is not "contagious". Radioactivity may be considered as "contagious" : radioactive substances may be transmitted from place to place, like an army that can move.