Module 5 - Geochronology

Question 1

Radioactive Decay Order

Answer 1

First Order

Question 2

Requirements for accurate geochronology estimate

Answer 2

• Accurate Decay Constant, no change with time
• All samples must be same age and are formed at the same time
• All samples must have same initial daughter isotope composition if daughter atoms initially present
• No disturbance to the isotope system since formation of the rock or mineral
• Good range in present-day concentrations or isotope ratios required for a precise age