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Which is the most suitable option here? A 2-cm-thick piece of cardboard placed over a radiation source would be most effective in protecting against ______ type of radiation.



A. Alpha
B. Beta
C. Gamma
D. X-ray

This question is part of Chemistry Standards Practice Test #1
Asked by Mr.r on Sep 08, 2017

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2 Answers

O. Miller

Have 3 years of Experience in journalism.

O. Miller
Content Optimization Executive, Studied Journalism and Psychology, Austin,Texas

Answered on May 10, 2019

A is the right answer. Alpha radiation or alpha particles contain two neutrons and two protons that are also known as the helium-4 nuclei. Due to their combined mass and their charges, they have a strong interaction with matter. Their velocities can only penetrate a sheet of paper up to two-centimeter cardboard.

This radiation cannot penetrate the outer dead skin cell layers; thus it cannot damage the live tissues underneath it. Though this radiation might not cause harm to people on Earth, this can be dangerous to astronauts as the magnetic field of the Earth deflects them. This can be extremely harmful to Earthlings when they have inhaled or ingested radioisotopes that emit alpha radiation.

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mr.r

Mr.r

Answered on Sep 08, 2017

Alpha
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