4.3.1 Background Radiation

In this lesson, we will explore background radiation. We will delve into the sources of both natural and man-made background radiation.

Background Radiation

Background radiation is a continuous presence of radiation in our environment. It originates from natural and man-made sources.

• Natural Background Radiation: Natural sources, such as rocks and cosmic rays from space, contribute to background radiation. Radioactive materials present in these sources emit radiation.
• Man-Made Background Radiation: Man-made background radiation is generated by human activities. This includes nuclear accidents and fallout from nuclear weapons testing.

Factors Affecting Background Radiation:

• Occupation: Certain occupations, such as nuclear power plant workers or radiographers, may have increased exposure to radiation due to their work.
• Location: Geographical location can impact background radiation levels. Different regions may have varying amounts of radioactive materials in the environment.

Radiation Dose

Radiation dose quantifies the amount of radiation absorbed by a person. It is measured in sieverts (Sv), which represents the biological effect of radiation on human tissues.

Radiation doses are often expressed in millisieverts (mSv) for practical purposes:

1000 millisieverts (mSv) = 1 sievert (Sv)

Conclusion

Background radiation is a continuous presence of radiation in our environment, stemming from both natural and man-made sources. Natural sources, like rocks and cosmic rays, contribute to background radiation through the emission of radiation from radioactive materials. Meanwhile, human activities, including nuclear accidents and nuclear weapons testing, generate man-made background radiation.