As this breakdown occurs, the activity of any radioactive source becomes less. This activity is measured in becquerels. Different radioactive ... The graph shows the decay curve for a radioactive ...

JON CHASE:'Nuclear weapons, nuclear power stations 'and life-saving medical techniques, all use radioactivity. JON CHASE:'But what is it? 'Elements hold the key. JON CHASE:'Every element is ...

Many chemical elements in rock exist in a number of slightly different forms, known as isotopes. Certain isotopes are unstable and undergo a process of radioactive decay, slowly and steadily ...

By comparing fossils of different primate species ... used dating methods are summarized in Table 1. The rate of decay for many radioactive isotopes has been measured and does not change over ...