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CHLORINE 36 <br />Chlorine 36 is a chlorine atom with one additional neutron (36C1). It also has a <br />cosmogenic origin. The measured 36CI/35CI ratio is also used in water age <br />determination similar to carbon 14. Chlorine 36 has a decay half-life of 301,000 <br />years for an age range of about 2,000,000 years (five to six half-lifes). The <br />measured minimum apparent age for Monitor Well COV23 is shown on Figure 5. <br />FIGURE 5- CHLORINE 36 WATER AGE, SAGE CREEK MINE <br />0 500,000 1,000,000 1,500,000 2,000,000 <br />Minimum Apparent Age, years <br />The measured minimum apparent age of Monitor Well COV23 was 1,150,000 <br />years. This was ancient water and not modern or recent water. A longer half <br />life isotope result such as iodine 129 or helium 4 may show it to be older. <br />7