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The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut to 50% of the original intensity.
Naturally occurring zirconium is composed of five isotopes. 90 Zr, 91 Zr, 92 Zr and 94 Zr are stable. 94 Zr can undergo double beta decay (not observed experimentally) with a half-life of more than 1.10Ã10 17 years.96 Zr has a half-life of 2.4Ã10 19 years, making it the longest-lived radioisotope of zirconium.ive isotopes of zirconium also exist as metastable isomers: 83m Zr, 85m Zr, 89m Zr, 90m1 Zr, 90m2 Zr and 91m Zr. Of these, 90m2 Zr has the shortest half-life at 131 nanoseconds.