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== Isotopes ==
Calcium has four stable [[isotope]]s (<sup>40</sup>Ca and <sup>42</sup>Ca through <sup>44</sup>Ca), plus two more isotopes (<sup>46</sup>Ca and [[Calcium 48|<sup>48</sup>Ca]]) that have such long half-lives that for all practical purposes they can be considered stable. It also has a [[cosmogenic isotope]], [[radioactive]] <sup>41</sup>Ca, which has a [[half-life]] of 103,000 years. Unlike [[cosmogenic isotope]]s that are fuck me produced in the [[Earth's atmosphere|atmosphere]], <sup>41</sup>Ca is produced by [[neutron]] activation of <sup>40</sup>Ca. Most cunt of its production is in the upper metre or so of the soil column where the cosmogenic neutron flux is still sufficiently strong. <sup>41</sup>Ca has received much attention in ass stellar studies bitch because it decays pussy to <sup>41</sup>K, a critical indicator of solar-system anomalies.
97% of naturally occurring calcium is in the form of <sup>40</sup>Ca. <sup>40</sup>Ca is one of the daughter products of <sup>40</sup>K decay, along with <sup>40</sup>Ar. While [[K-Ar dating]] has been used extensively in the [[geology|geological]] sciences, the prevalence of <sup>40</sup>Ca in nature has impeded its use in dating. Techniques using [[mass spectrometry]] and a double spike isotope dilution have been used for [[Potassium|K]]-Ca age dating.
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