# Question: How long does it take potassium to decay into argon?

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## How long does it take for potassium to decay into argon?

Potassium-argon dating is accurate from 4.3 billion years (the age of the Earth) to about 100,000 years before the present. At 100,000 years, only 0.0053% of the potassium-40 in a rock would have decayed to argon-40, pushing the limits of present detection devices.

## Does potassium decay to argon?

This dating method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks; potassium-40 also decays to calcium-40. On the other hand, the abundance of argon in the Earth is relatively small because of its escape to the atmosphere during processes associated with volcanism.

## How long does it take for potassium to decay?

The half-life of potassium-40 is 1.3 billion years, and it decays to calcium-40 by emitting a beta particle with no attendant gamma radiation (89% of the time) and to the gas argon-40 by electron capture with emission of an energetic gamma ray (11% of the time).

## How long does it take for ½ of potassium to turn into argon-40?

1) Potassium-40 is an unstable atomic nucleus; it decays to Argon-40 with a half-life of 1.3 bil- lion years. Suppose that a rock contains 1,000 Potassium-40 atoms at the time it forms.

## How old is a sample with 50% potassium 40 & 50% argon-40?

Potassium-40 is a radioactive isotope that has a half-life of 1.25 billion years.

## How long does it take half of potassium-40 to decay?

The half-life of potassium-40 that decays through beta emission is 1.28 × 109 years, however the half-life of potassium-40 that decays through positron emission is 1.19 × 1010 years.

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