Activity is measured in counts per minute (counts min–1).

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Presentation transcript:

Activity is measured in counts per minute (counts min–1). Radio-Carbon Dating Radio-carbon dating is used to estimate the age of objects that were once living. All living things contain a small amount of radioactive carbon 14 . Carbon 14, which has a half-life of 5700 years, decays to carbon 12. By measuring the activity of a sample of dead tissue, its approximate age can be determined. Activity is measured in counts per minute (counts min–1). A sample of living wood has an activity of 16 counts min–1 g–1 Calculate the activity of a 20 g sample of living wood. 2 Hence calculate the activity of a 20 g sample of wood from a tree that died 17,100 years ago. State the correct unit for your answer. NZQA 90256 2004

Radio-Carbon Dating Radio-carbon dating is used to estimate the age of objects that were once living. All living things contain a small amount of radioactive carbon 14 . Carbon 14, which has a half-life of 5700 years, decays to carbon 12. By measuring the activity of a sample of dead tissue, its approximate age can be determined. Activity is measured in counts per minute (counts min–1). A sample of living wood has an activity of 16 counts min–1 per gramme. Calculate the activity of a 20 g sample of living wood. 1 gramme = 16 counts min–1 20 g = 16 x 20 counts min–1 320 counts min–1 A NZQA 90256 2004

Radio-Carbon Dating Radio-carbon dating is used to estimate the age of objects that were once living. All living things contain a small amount of radioactive carbon 14 . Carbon 14, which has a half-life of 5700 years, decays to carbon 12. By measuring the activity of a sample of dead tissue, its approximate age can be determined. Activity is measured in counts per minute (counts min–1). 2 Hence calculate the activity of a 20 g sample of wood from a tree that died 17 100 years ago. State the correct unit for your answer. M NZQA 90256 2004