Changes

*[[Alpha Particle|Alpha particles]] are [[helium]] [[nucleus|nuclei]].*They can be stopped by a sheet of paper or human skin.*Poses a health risk if alpha-emitting substances are inhaled or ingested.

*[[Polonium]]-210 emits [[Alpha Particle|alpha particles]] and is highly [[toxic]] if ingested.*[[Alpha Particle|Alpha radiation]] is used in some types of smoke detectors.