When a beta-particle (an energetic electron emitted from the nucleus of a radioa

Question

When a beta-particle (an energetic electron emitted from the nucleus of a radioactive material) penetrates a material, it will keep coursing until its kinetic energy is totally spent. The depth of penetration depends on the speed of the particle when it enters the material, the density of the material, and the nature of the radiation. As a general rule, other parameters being equal, a denser material will permit a shorter distance of penetration. Using the same radioactive source, and placing the different materials listed below from the same distance, arrange the follow materials in descending order of penetration: (a) Concrete (b) Plastic (c) Cardboard (d) Wood (e) Alcohol (f) Lead

Explanation / Answer

Penetration depends mainly on the density of their components as "macro" vs. "micro" stages

therefore:

Lead > Concrete > plastic > Wood > Cardboard ( i.e. paper) > Alcohol

Note that lead is the most dense

Concrete has a large amount of density

Plastic, due to polymerization density

Wood is ok, since it has lots of cellulose (natural polymer)

Finally, cardboard and alcohol are not dense enough

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.