The illustration below shows how a radioactive sample is decaying over time. From the start of timing it takes 2 days for the count to halve from 80 down to 40. It takes another two days for the ...

However, as the number of protons increases, more neutrons are needed to keep the nucleus stable. For example lead (lead-206) has 82 protons and has 124 neutrons. If the nucleus has too few ...

Radioactivity is a part of our earth - it has existed all along. Naturally occurring radioactive materials are present in its crust, the floors and walls of our homes, schools, or offices and in the ...

Radioactivity is a part of our earth - it has existed all along. Naturally occurring radioactive materials are present in its crust, the floors and walls of our homes, schools, or offices and in the ...