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The beta electrons of the decay into calcium 40 (89.3% of the time) are not accompanied by gamma rays, and are generally absorbed into the medium they find themselves in.

IN2P3Stable nuclei sit at the bottom of a so-called ‘valley of stability’, a concept that helps determine whether a nucleus is radioactive or not.

Education, science, chemistry and children concept - kids or students with test tube making experiment at Boys with test tube studying chemistry at school.

Education, science and children concept - boys in goggles with test tube studying chemistry at school Kids with test tube studying chemistry at school.

In both argon 40 and calcium 40, however, the number of protons and neutrons are even, granting them that extra stability.

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Education, science, chemistry and children concept - kids or students with test tube making experiment at Girl with test tube studying chemistry at school.

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