Many smoke detectors contain a small amount of the isotope Americium-241, which emits alpha radiation. Should a person walking under such a smoke detector be concerned about being hit by the alpha particles? Explain your answer using something you learned in this lab. In the medical imaging procedure known as a PET scan (Positron Emission Tomography), positrons from a radioactive tracer strike electrons in the body's tissues. This produces radiation, and this radiation is then observed using a detector outside the body. Based on this information, do you think the positron-electron collisions create alpha, beta, or gamma radiation? Explain your answer using something you learned in this lab.

Many smoke detectors contain a small amount of the isotope Americium-241, which emits alpha radiation. Should a person walking under such a smoke detector be concerned about being hit by the alpha particles? Explain your answer using something you learned in this lab. In the medical imaging procedure known as a PET scan (Positron Emission Tomography), positrons from a radioactive tracer strike electrons in the body's tissues. This produces radiation, and this radiation is then observed using a detector outside the body. Based on this information, do you think the positron-electron collisions create alpha, beta, or gamma radiation? Explain your answer using something you learned in this lab.