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Due to this reason it has been denoted by an Alpha particle in the second reaction.

Thorium-234 is the next radioactive substance in the decay process of Uranium-238.

Uranium-238 is a common radioactive isotope of Uranium.

The unstable atomic nucleus of Uranium-238 emits ionizing particles and loses energy in order to achieve a stable state. This isotope undergoes Alpha decay by emitting Alpha rays. Following is the equation for the Alpha (α) radiation of this isotope: He (Helium) is similar to an Alpha particle having mass number of 4 and atomic number 2.

of sediments from either a marine or a playa lake environment.

Carbon 14 with a half life of 5,700 years can only be used to date fossils of approximately 50,000 years. If 50% of pure uranium' is left in a sample the sample is assumed to be 4.5 billion years old.( This is assuming that the original sample was 100% uranium and no Uranium 238 has been eroded or lost in 4.5 billion years old.

The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.

The process of dating finds the two ratios between uranium-235 and lead-207; and uranium-238 and lead-206.




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