Radioactive Decay And Nuclear Radiation (GCSE Physics)

A radioactive sample has an activity of 240 Bq. After one half-life its activity will be:

What is the main reason nuclear waste with long half-lives is stored deep underground and isolated?

Which of the following is a correct example of radioactive decay equation for beta minus emission of carbon-14?

In beta minus decay, what change occurs in the nucleus?

Which absorber would most reduce gamma radiation intensity?

Which nuclear radiation is a high-energy electromagnetic wave with no mass or charge and is most penetrating?

A sample emits 500 counts per minute at 1 m distance. If the detector is moved to 2 m, approximately what count rate would be expected assuming a point source and inverse square law (neglecting background)?

Why are alpha-emitting sources considered a serious hazard if ingested but less hazardous externally?

Why are lead aprons or shields used when working with gamma emitters?

Which of the following materials is most effective at stopping alpha particles?

Which property correctly compares alpha, beta and gamma radiation in terms of ionising power and penetration (highest ionising ? lowest ionising)?