The concept of the half-life of a radioactive isotope allows geophysicists to estimate the age of the Earth, archaeologists to estimate the ages of fossils and artefacts, and medical staff to diagnose and treat a range of conditions both safely and effectively.  Sadly, it’s a topic which is often misunderstood (and occasionally hated) by GCSE students, but it doesn’t have to be that way.  Watch, relax and enjoy.

Please note that this video includes some higher tier-only content.

Key Words

nucleus, sample, mass, ratio, isotope, random, radioactive decay, decay, activity, count rate, Geiger-Muller tube, half-life, nuclei