Question 1

Which of the following statements best defines radioactivity?

Accepted Answer

The spontaneous emission of energy from the nucleus of an unstable atom.

Question 2

Which of the following forms of radiation has the greatest penetrating power through human tissue?

Accepted Answer

Gamma rays ($$\gamma)$$

Question 3

A radioisotope emits a particle with the following symbol: $$\$$displaystyle ^4$$_2	ext{He}. $$What type of radiation is this?

Accepted Answer

Alpha particle

Question 4

Which of the following is a correct description of a beta particle?

Accepted Answer

A high-energy electron with a $$1-$$ charge, represented as $$\$$displaystyle ^0$$_{-1}	ext{e}$$

Question 5

Which of the following forms of radiation is most dangerous if inhaled or ingested, but is stopped by paper or clothing?

Accepted Answer

Alpha particles ($$\alpha)$$

Question 6

A positron is emitted from a nucleus. What happens to the atomic number and mass number of the atom?

Accepted Answer

Atomic number decreases by 1; mass number remains unchanged.

Question 7

Which of the following best describes the biological effect of ionizing radiation on living cells?

Accepted Answer

It can eject electrons from atoms, making them more reactive and less stable.

Question 8

Which of the following is the SI unit used to measure the biological effect of radiation?

Accepted Answer

Sievert ($$	ext{Sv})$$

Question 9

A patient receives a radiation dose of 250,000 mrem in a short period. Based on the clinical effects, what is the most likely outcome?

Accepted Answer

Moderate radiation poisoning with possible permanent sterility and recovery over several months.

Question 10

Which of the following forms of radiation is represented by $$\$$displaystyle ^1$$_0	ext{n}$$ and can be used to induce radioactive decay in other nuclei?

Accepted Answer

Neutron

Question 11

Which of the following statements about gamma rays is correct?

Accepted Answer

They are high-energy electromagnetic radiation with no mass or charge.

Question 12

Which of the following best explains why people working with radioactive materials wear film badges?

Accepted Answer

To monitor their total exposure to ionizing radiation over time.

Question 13

Which of the following is a real-world example of a source of natural ionizing radiation?

Accepted Answer

Cosmic rays from outer space

Question 14

Which of the following forms of radiation will penetrate through the body and requires thick lead or concrete for shielding?

Accepted Answer

Gamma rays ($$\gamma)$$

Question 15

If a radioactive isotope emits a beta particle, what happens to its atomic number and mass number?

Accepted Answer

Atomic number increases by 1; mass number remains unchanged.

Question 16

Which of the following is a common effect of exposure to 60,000 mrem of radiation?

Accepted Answer

Mild radiation sickness with a large decrease in white blood cells, nausea, and vomiting.

Question 17

Which of the following is true about isotopes with atomic numbers 83 and higher?

Accepted Answer

All isotopes of these elements are radioactive.

Question 18

Which of the following best describes the effect of ionizing radiation on rapidly dividing cells?

Accepted Answer

They are killed off more quickly than other cells.

Question 19

Which of the following is a correct statement about the relationship between radiation dose and clinical effects?

Accepted Answer

Short-term intense exposure is more life-threatening than long-term low-level exposure.

Question 20

Which of the following forms of radiation is represented by $$\$$displaystyle ^0$$_{+1}	ext{e}$$ and is emitted when a proton is converted to a neutron?

Accepted Answer

Positron

Radioactivity and Radioisotopes: Forms, Effects, and Protection

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