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For students in the 2004 Graduation Program, all Grade 12 exams are optional except for the Language Arts 12 and BC First Nations Studies 12 exams.Optional exams will be offered in sixteen Grade 12 courses (the same as the existing set of exams).When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.ALERT: Before you purchase, check with your instructor or review your course syllabus to ensure that you select the correct ISBN.

Some measure the decay of isotopes more indirectly.

All radiometric dating methods measure isotopes in some way.

Most directly measure the amount of isotopes in rocks, using a mass spectrometer.

For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.

Another example is luminescence dating, which measures the energy from radioactive decay that is trapped inside nearby crystals.

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