4.3.1 Background Radiation

• The largest source of background radiation is radon
• What is the primary origin of medical background radiation?

  X-rays and nuclear medicine
• Radon gas is naturally released from the earth's crust.

  True
• The largest source of background radiation is radon gas, which contributes approximately 50%
• What is one risk associated with long-term exposure to background radiation?

  Increased cancer risk
• Background radiation provides a baseline level of radiation exposure for all living organisms.

  True
• Match the source of background radiation with its origin:

  Radon ↔️ Natural gas from the earth

  Cosmic rays ↔️ Radiation from space

  Medical ↔️ X-rays and nuclear medicine
• Cosmic rays account for 15% of background radiation.
• Order the sources of background radiation by their percentage contribution from highest to lowest:

  1️⃣ Radon

  2️⃣ Cosmic rays

  3️⃣ Medical

  4️⃣ Food and water

  5️⃣ Nuclear industry
• What type of radiation is associated with medical sources in background radiation?

  X-rays
• Match the effect of background radiation with its risk or benefit:

  Long-term exposure ↔️ Increased cancer risk

  Short-term exposure ↔️ Minimal impact at normal levels

  High-dose exposure ↔️ Radiation sickness
• The severity of the effects of background radiation depends on the dosage and duration of exposure.
• What unit measures the activity of a radioactive source in background radiation?

  Becquerel
• Match the instrument for measuring background radiation with its primary use:

  Geiger-Müller counters ↔️ Detects beta and gamma radiation

  Scintillation detectors ↔️ Sensitive radiation measurement

  Film badges ↔️ Long-term exposure monitoring
• What is background radiation?

  Low-level ionizing radiation
• Cosmic rays contribute to background radiation.

  True
• Arrange the sources of background radiation in descending order of their contribution.

  1️⃣ Radon

  2️⃣ Medical

  3️⃣ Cosmic rays

  4️⃣ Food and water

  5️⃣ Nuclear industry
• Which source of background radiation contributes the most to radiation exposure for humans?

  Radon gas
• Background radiation has no beneficial effects on human health.

  False
• Low levels of background radiation are used in medical imaging, such as X-rays
• What is background radiation?

  Low-level ionizing radiation
• Background radiation provides a baseline level of radiation exposure
• What is the largest contributor to background radiation?

  Radon
• Radon is released from natural gas in the earth.


  True
• Cosmic rays originate from space.
• Radon gas contributes to 50% of background radiation.


  True
• What is a major risk associated with long-term exposure to background radiation?

  Increased cancer risk
• Low levels of background radiation are sometimes used beneficially in medical procedures.


  True
• The Sievert measures the absorbed radiation dose and its biological effect on humans.
• Why is regular monitoring of background radiation important?

  Ensures public safety