So then answer this.?

Question

What is the half life of Chenobal and Christmas Island and pop in hiroshima and nagasaki?

Answer 1

you mean, how long until the radiation is back to normal?

Many parts of northern Scandonavia still cant eat meat or fish from certain place, livestock is OK because its feeding and grazing location is controlled.

As the above says, it depends on what elements you are taking about and average joe will not get told what is out there.

Answer 2

The explosion at Chernobyl released a large amount of radioactivity from the reactor including Caesium-137 and Strontium-90 which both have physical half-lives of about 30 years, although there are also actinides (such as plutonium) which have half-lives of many thousands of years.

The fissile material used in the Hiroshima bomb was uranium-235. uranium-235: half life = 704 million years.

The fissile material used in the Nagasaki bomb was plutonium-239. Pu-239, the more common isotope of Plutonium has a half life of 24,000 years.

As to Christmas Island -
After the departure of the Forces, Operation "Hard Look" had carried out a full investigation into the possibilities of radio-active contamination, but had found none. In 1975 a further examination of Christmas Island was undertaken by American experts as part of the preparation for the establishment of a Japanese tracking station. They reported that radioactivity levels were lower than those found in most American cities and that there was nothing on the island which could lead an investigator to deduce that there had ever been an atomic detonation in the vicinity.

Believe that if you will!

Answer 3

Half life in Chernobyl for example will take thousands of years to reach because of the intensity of the radiation. radiation has a half life which after a certain amount (depending on the amount of radiation) of time is reduced by half, basically it becomes half dead.

Chernobyl even now is so restricted because of how intense the radiation is, the scientists who go to study their are carried in by air with protective clothing such as led and are only allowed there for two weeks before they are again hoisted out.

Ever heard of nuclear medicine. for example you need to get a VQ lung scan to rule out pulmonary embolism, you inhale a radioactive nebulizer and then get pictures taken of your lungs not x-rays. it is kind of like an x-ray from the inside out and you get a picture of your lungs from every angle. no to make a radioactive nebulizer you need a hot kit (radioactive) and every time before you inject this kit into the nebulizer you need to put it in this machine to measure the life of the radiation. being that it is a small dose of radiation, it can reduce to half life rather quickly.

Answer 4

Radioactive isotopes have a half-life. I am not certain of the meaning of your question. Perhaps the Physics forum?