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Natural gas is often found trapped in layers of shale that contain large amounts of radioactive potassium. As the potassium isotopes decay, they emit gamma radiation. When drilling to find natural gas reserves, geologists may look for high levels of gamma radiation from rock layers. Gamma Decay of Potassium-40 and Associated Nuclide Masses 40 K - Art ety Nuclide Potassium Argon Mass (x10-3 isotope = isotope = positron = Gamma = 0.000549 0.00 kg/mol) 39.96400 39.9623831 17. What is the change in mass that occurs during the radioactive decay of 1.00 mol of potassium-40, 1, A 1.06x10 3Kg 1.07x10-6Kg 1.07x10-Kg 1.06 x10 Kg