However, once the organism dies, the amount of carbon steadily decreases. Lesson for Kids. The graph below shows the decay curve you may recognize it as an exponential decay and it shows the amount, or percent, of carbon remaining. From about untilwhen atmospheric nuclear testing was banned, it is estimated that several tonnes of 14 C were created. The half-life of 14 C the time it takes for half of a given amount of 14 C to decay is about 5, years, so its concentration in the atmosphere might be expected to reduce over thousands of years, but 14 C is constantly being produced in the lower stratosphere and upper troposphereprimarily by galactic cosmic raysand to a lesser degree by solar cosmic rays.
Another example is driftwood, which may be used as construction material.
What's your main goal? University of Glasgow. This process, which continues until no 14 C remains, is the basis of carbon dating. I am a student I am a teacher. My Dictionary. They are derived from biomass that initially contained atmospheric levels of 14 C. The method was developed in the late s by Willard Libbywho received the Nobel Prize in Chemistry for his work in