[{"from": "human", "value": "Could you give me a brief overview of this molecule? [40K]"}, {"from": "gpt", "value": "The molecule is a naturally occurring radioactive isotope of potassium. Potassium is the chemical element with the symbol K and atomic number 19. Potassium is widely distributed in nature and is present in all plant and animal tissues. Potassium-40 comprises about 0.012% of naturally occurring potassium. It is the predominant radioactive component in human tissues and in most food. Potassium-40 has a half-life of 1.3 billion years and emits beta and gamma radiation. (L1134, L1851)"}]