## What element has the highest half-life?

Barium-130 decays into xenon-130 through the process of double electron capture with a half-life of 0.5–2.7×1021 years, around a hundred times that of bismuth, and tellurium-128 is the all time champion, decaying into xenon-128 by double beta decay with a half-life of 2.2×1024 years.

## What is the longest lived isotope?

With a half-life of 81 million years, plutonium-244, the longest-lived plutonium (Pu) isotope, can be produced both naturally and by anthropogenic means.

**Is a longer half-life more radioactive?**

The longer the half-life of a nucleus, the lower the radioactive activity. A nucleus with a half-life that is a million times greater than another will be a million times less radioactive. A ‘half-life’ is defined as the amount of time taken for the number of nuclei present in a sample at a given time to exactly halve.

**Which radioactive element has the shortest half-life?**

Copernicium 285 has the shortest half life, which is 5*10^-19 seconds. Longest is definitely uranium 238, over a billion years.

### What has a half-life of 5000 years?

Most living things contain carbon-14, an unstable isotope of carbon that has a half-life of around 5,000 years.

### Which element does not decay?

Thus, 252 isotopes (nuclides) are stable by definition (including tantalum-180m, for which no decay has yet been observed).

**How long is the half-life of plutonium?**

24,000 years

Plutonium-239 (a manmade isotope) has a half-life of 24,000 years. For the most common uranium isotope, U-238, the half-life is 4.5 billion years, about the age of the solar system.

**What is gold’s half-life?**

Gold (79Au) has one stable isotope, 197Au, and 36 radioisotopes, with 195Au being the most stable with a half-life of 186 days.

## How long will Chernobyl be radioactive?

How Long Will It Take For Ground Radiation To Break Down? On average, the response to when Chernobyl and, by extension, Pripyat, will be habitable again is about 20,000 years.

## What is the half-life of Chernobyl?

In the “reserve” remains plutonium-239, which, according to experts, has pollinated a hundred-kilometer zone around the Chernobyl nuclear power plant. Its half-life is 24,000 years. How will you protect yourself?

**What has a half-life of 6 hours?**

List of common medicines or substances and their half-lives

Generic Name | Brand Name Examples | Half-life (T1/2*) |
---|---|---|

Atenolol | Tenormin | 6-7 hours |

Clonazepam | Klonopin | 18-50 hours |

Cocaine | – | 50 minutes |

Diazepam | Valium | 20-100 hours |

**Does half-life reach zero?**

Regardless of which variable or version of the equation you use, the function is a negative exponential, meaning it will never reach zero. For each half-life that passes, the number of nuclei is halved, becoming smaller and smaller but never quite vanishing – at least, this is what happens mathematically.

### How fast does carbon-14 decay?

The time it takes for 14C to radioactively decay is described by its half-life. C has a half-life of 5,730 years. In other words, after 5,730 years, only half of the original amount of 14C remains in a sample of organic material.

### Does half-life ever reach 0?

This expected number gets smaller and smaller but never reaches zero.

**What is the heaviest stable element?**

The heaviest naturally stable element is uranium, but over the years physicists have used accelerators to synthesize larger, heavier elements.

**Does gold ever decay?**

Gold. It’s shiny, metallic, and melts easily into bars, coins, or jewelry. It doesn’t rust, corrode, or decay.

## What is the half-life of uranium?

about 4.5 billion years

The half-life of uranium-238 is about 4.5 billion years, uranium-235 about 700 million years, and uranium-234 about 250 thousand years.

## Is Chernobyl core still burning?

It is no longer ‘melting’, but parts of it are still apparently hot enough for the uranium atoms to fission more than expected, spewing out neutrons that break more uranium atoms apart. The overall reactivity is low, but it is concerning that it’s rising.

**Why does Putin want Chernobyl?**

So why does Russia want Chernobyl nuclear power plant? As per analysts, the simple reason behind this is geography as Chernobyl is located on the shortest route from Belarus to Ukraine’s capital city of Kyiv and runs along a logical line of attack for the Russian forces invading Ukraine.

**Is Chernobyl reactor 4 still burning?**

Nuclear experts quickly chimed in that the fears were unfounded. Power was soon restored and Chernobyl is now safely out of the war’s hot zone.

### Was Fukushima worse than Chernobyl?

Chernobyl had a higher death toll than Fukushima

While evaluating the human cost of a nuclear disaster is a difficult task, the scientific consensus is that Chernobyl outranks its counterparts as the most damaging nuclear accident the world has ever seen.

### What is half-life of a pill?

by Drugs.com

The half-life of a drug is the time taken for the plasma concentration of a drug to reduce to half its original value. Half-life is used to estimate how long it takes for a drug to be removed from your body. For example: The half-life of Ambien is about 2 hours.

**Does half-life go forever?**

The half-life of a radioactive element means that, on average, half of the unstable nuclei will decay within one half-life. So if the half-life is 1 year, then after 3 years there will be (roughly) 1/8 of the original number of unstable nuclei in the sample.

**Can radioactive decay be stopped?**

Yes, the decay half-life of a radioactive material can be changed. Radioactive decay happens when an unstable atomic nucleus spontaneously changes to a lower-energy state and spits out a bit of radiation. This process changes the atom to a different element or a different isotope.

## Can you carbon date a living human?

Measuring carbon-14 levels in human tissue could help forensic scientists determine age and year of death in cases involving unidentified human remains. Archaeologists have long used carbon-14 dating (also known as radiocarbon dating) to estimate the age of certain objects.