Is there still nuclear radiation in Hiroshima and Nagasaki?

"Today's Hiroshima can't say that there is no nuclear radiation at all, but at least it meets the basic conditions for human survival.

According to the data released by the United Nations Scientific Committee on the Effects of Atomic Radiation, the radiation value in Hiroshima is now about 0.3 microsieverts per hour, which can reach 2.64 microsieverts per year (the natural radiation acceptable to ordinary people is 2.3 microsieverts per year). In other words, the radiation value in Hiroshima is equivalent to the world average.

This is the first time in human history that nuclear weapons have been used in actual combat, and it also makes human beings see the unprecedented lethality and destructive power of nuclear weapons for the first time, and truly feel the terror of nuclear weapons.

A large amount of nuclear radiation will be produced after the explosion of nuclear weapons. The "little boy" uses uranium -235 radioisotope with a half-life of 700 million years.