Safety and Uses of Radiation Quiz

9th Grade

Reviewed by Ekaterina Yukhnovich

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By Thames

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| Questions: 20 | Updated: Mar 8, 2026

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1. Background radiation means radiation that:

Only comes from hospitals

Is naturally present around us all the time

Is visible light

Is only from the sun

Concept: background radiation. Background sources include rocks, cosmic rays, etc. It is always present at low levels, even when we are not near any man-made sources.

Explanation

Concept: background radiation. Background sources include rocks, cosmic rays, etc. It is always present at low levels, even when we are not near any man-made sources.

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About This Quiz

Safety and Uses Of Radiation Quiz - Quiz

This assessment explores the safety measures and applications of radiation in various fields. It evaluates understanding of key concepts, including radiation types, safety protocols, and their uses in medicine and industry. This knowledge is crucial for professionals working with radiation to ensure safe practices and minimize risks.

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2. Some rocks and soil contain naturally radioactive materials.

True

False

Concept: natural radioactivity. Small amounts of radioactive isotopes occur naturally. Materials like certain rocks can contain uranium, thorium, or their decay products.

Explanation

Concept: natural radioactivity. Small amounts of radioactive isotopes occur naturally. Materials like certain rocks can contain uranium, thorium, or their decay products.

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3. Which material is best for shielding gamma radiation (among these)?

Paper

Aluminum foil

Thick lead (or concrete)

Plastic wrap

Concept: gamma shielding. Dense materials reduce gamma more effectively. Gamma rays are very penetrating, so thick, high-density shielding is usually needed.

Explanation

Concept: gamma shielding. Dense materials reduce gamma more effectively. Gamma rays are very penetrating, so thick, high-density shielding is usually needed.

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4. A device often used to detect radiation is a geiger-______ counter.

Concept: radiation detection. Geiger–müller counters detect ionizing radiation. They work by detecting ionization in a gas and producing electrical pulses you can count.

Explanation

Concept: radiation detection. Geiger–müller counters detect ionizing radiation. They work by detecting ionization in a gas and producing electrical pulses you can count.

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5. The main safety rule with radiation exposure is to reduce:

Sound

Time near the source and increase distance/shielding

Light reflection

Temperature only

Concept: time–distance–shielding. Time–distance–shielding reduces dose. Spending less time nearby, standing farther away, and using shielding all lower exposure.

Explanation

Concept: time–distance–shielding. Time–distance–shielding reduces dose. Spending less time nearby, standing farther away, and using shielding all lower exposure.

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6. Increasing distance from a radiation source usually reduces exposure.

True

False

Concept: distance reduces intensity. Intensity generally decreases with distance. Moving away spreads the radiation over a larger area, so less reaches you.

Explanation

Concept: distance reduces intensity. Intensity generally decreases with distance. Moving away spreads the radiation over a larger area, so less reaches you.

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7. A common medical use of radioactive materials is:

Charging phones

Imaging/diagnosis (tracers) or cancer treatment

Making water boil instantly

Producing sound

Concept: nuclear medicine. Nuclear medicine uses tracers and radiotherapy. Tracers help doctors see processes inside the body, and radiotherapy uses radiation to target cancer cells.

Explanation

Concept: nuclear medicine. Nuclear medicine uses tracers and radiotherapy. Tracers help doctors see processes inside the body, and radiotherapy uses radiation to target cancer cells.

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8. Ionizing radiation can damage living cells.

True

False

Concept: ionization and biological damage. It can ionize atoms and harm DNA. Damage happens because ionization can break chemical bonds or create reactive molecules in cells.

Explanation

Concept: ionization and biological damage. It can ionize atoms and harm DNA. Damage happens because ionization can break chemical bonds or create reactive molecules in cells.

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9. Which is not a type of ionizing radiation?

Gamma rays

Beta particles

Alpha particles

Microwaves

Concept: ionizing vs non-ionizing. Microwaves are non-ionizing. They do not usually have enough energy per photon to ionize atoms in the way alpha, beta, and gamma can.

Explanation

Concept: ionizing vs non-ionizing. Microwaves are non-ionizing. They do not usually have enough energy per photon to ionize atoms in the way alpha, beta, and gamma can.

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10. Which radiation is least penetrating and most easily stopped?

Gamma

Beta

Alpha

Neutron

Concept: comparing penetration. Alpha is stopped by paper/skin surface. Despite low penetration, alpha can be very harmful if it gets inside the body.

Explanation

Concept: comparing penetration. Alpha is stopped by paper/skin surface. Despite low penetration, alpha can be very harmful if it gets inside the body.

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11. A key idea in radiation safety is minimizing ______, maximizing distance, and using shielding.

Concept: time–distance–shielding again. Time–distance–shielding. Reducing time near a source is often the simplest way to lower dose quickly.

Explanation

Concept: time–distance–shielding again. Time–distance–shielding. Reducing time near a source is often the simplest way to lower dose quickly.

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12. Smoke detectors can contain a small radioactive source (in some types).

True

False

Concept: everyday use of radioactivity. Some detectors use americium-241 (historically/common in ionization types). The source is very small and sealed so it can be used safely in the device.

Explanation

Concept: everyday use of radioactivity. Some detectors use americium-241 (historically/common in ionization types). The source is very small and sealed so it can be used safely in the device.

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13. Radiation used to kill cancer cells is called:

Insulation

Radiotherapy

Reflection therapy

Sound therapy

Concept: medical treatment with radiation. Radiotherapy uses ionizing radiation. It aims to damage cancer cell DNA so the cells stop dividing.

Explanation

Concept: medical treatment with radiation. Radiotherapy uses ionizing radiation. It aims to damage cancer cell DNA so the cells stop dividing.

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14. Alpha particles are dangerous if inhaled or swallowed, even though they don’t penetrate skin well.

True

False

Concept: internal vs external hazard. Inside the body, alpha can cause significant damage locally. Because alpha ionizes strongly, it can harm nearby cells when the source is internal.

Explanation

Concept: internal vs external hazard. Inside the body, alpha can cause significant damage locally. Because alpha ionizes strongly, it can harm nearby cells when the source is internal.

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15. Which can reduce exposure to radiation?

Use shielding

Increase distance

Reduce time

Stand closer for longer

Concept: reducing dose. A–C reduce dose. Standing closer for longer increases exposure because it increases time near the source and decreases distance.

Explanation

Concept: reducing dose. A–C reduce dose. Standing closer for longer increases exposure because it increases time near the source and decreases distance.

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16. Gamma rays can travel through the body more easily than alpha particles.

True

False

Concept: penetration in tissue. Gamma is more penetrating. Alpha particles are stopped quickly, while gamma rays can pass deeper through tissue.

Explanation

Concept: penetration in tissue. Gamma is more penetrating. Alpha particles are stopped quickly, while gamma rays can pass deeper through tissue.

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17. A Geiger counter measures radiation mainly by detecting:

Sound waves

Ionization events

Heat conduction

Magnetism

Concept: how a Geiger counter works. Ionizing radiation produces detectable electrical pulses. Each pulse corresponds to ionization in the detector gas caused by radiation passing through.

Explanation

Concept: how a Geiger counter works. Ionizing radiation produces detectable electrical pulses. Each pulse corresponds to ionization in the detector gas caused by radiation passing through.

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18. Which situation gives the greatest shielding for gamma (best choice)?

Paper sheet

Thin plastic

Thick concrete wall

Cloth

Concept: dense shielding. Dense, thick materials shield gamma better. Thickness and density both matter because gamma rays need many interactions to be reduced significantly.

Explanation

Concept: dense shielding. Dense, thick materials shield gamma better. Thickness and density both matter because gamma rays need many interactions to be reduced significantly.

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19. Not all radiation exposure is harmful; small natural background is normal.

True

False

Concept: background exposure. We are exposed to natural background continuously. Risk depends on dose, time, and the type of exposure, so low natural levels are part of everyday life.

Explanation

Concept: background exposure. We are exposed to natural background continuously. Risk depends on dose, time, and the type of exposure, so low natural levels are part of everyday life.

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