Radioactive sources can emit α\alphaα-(alpha), β\betaβ-(beta) and γ\gammaγ-(gamma) radiations.
State which of these types of radiation cannot pass through a thin sheet of paper.
Iodine-131 is a radioactive isotope. The nuclide notation for iodine-131 is:
53131I ^{131}_{53}\text{I} 53131IDetermine the number of neutrons in a nucleus of iodine-131.
A radioactive source contains 48 mg48\text{ mg}48 mg of an isotope that has a half-life of 4 hours4\text{ hours}4 hours. Calculate the mass of this isotope that remains in the source after 12 hours12\text{ hours}12 hours.
144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.