The diagram illustrates apparatus used to identify the type of emissions produced by a radioactive source. The absorbers may be lifted out of, or lowered into, the route taken by the radiation from the source to the detector. The apparatus is evacuated. The table presents a set of results for one particular radioactive source. Which types of radiation are emitted by the radioactive source?
- A$\alpha$-particles and $\beta$-particles
- B$\alpha$-particles only
- C$\beta$-particles and $\gamma$-rays
- D$\beta$-particles only