Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Naturally occurring zirconium (Zr) is composed of four stable isotopes, and one extremely long-lived radioisotope (96Zr), which decays via double beta decay with the observed half-life of 2.0x1019 years; it can also undergo single beta decay which is not yet observed, but the theoretically predicted value of T 1/2 is 2.4x1020 years. The second most stable radioisotope is 93Zr which has a half-life of 1.53 million years

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