Natural positron emitters

In summary, natural positron emitters are radioactive isotopes that emit positively charged particles and occur naturally in the environment. They differ from other types of radioactive isotopes in their decay process and types of radiation emitted. Examples include potassium-40, carbon-11, and rubidium-82, and they are used in various scientific fields for research purposes. While there are potential risks associated with handling these isotopes, they can be safely used with proper precautions.
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There are 3 long lived (over 10^9 years) isotopes which may capture electrons and have actually been observed to undergo single beta transmutation.

Interestingly, all these 3 ALSO can undergo beta decay AND positron emission.

Potassium 40 has a branching ratio of about 1000 electron captures per positron emission.

But how about the other two? What are the experimentally observed branching ration between positron emission and electron capture for lanthanum 138 and vanadium 50?
 
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What are natural positron emitters?

Natural positron emitters are radioactive isotopes that emit positrons, which are positively charged particles with the same mass as an electron but with opposite charge. These isotopes occur naturally in the environment and can also be artificially produced in laboratories.

How do natural positron emitters differ from other types of radioactive isotopes?

Natural positron emitters differ from other types of radioactive isotopes in that they decay through the emission of positrons, rather than alpha or beta particles. This results in a unique decay process and different types of radiation emitted.

What are some examples of natural positron emitters?

Some examples of natural positron emitters include potassium-40, carbon-11, and rubidium-82. These isotopes have a relatively short half-life, meaning they decay quickly and emit positrons in the process.

How are natural positron emitters used in scientific research?

Natural positron emitters are used in various scientific fields, including medicine, physics, and environmental studies. They can be used as tracers to study biological processes, as markers to track the movement of chemicals in the environment, and as sources of positrons for medical imaging techniques such as positron emission tomography (PET).

Are there any potential risks associated with natural positron emitters?

As with all radioactive materials, there are potential risks associated with natural positron emitters if they are not handled properly. However, the levels of radiation emitted by these isotopes are typically very low and easily shielded, making them relatively safe to work with in controlled environments. As with any scientific research, proper safety protocols should always be followed.

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