Background Radiation, Natural & Artificial | Ch 21 NUCLEAR PHYSICS | Phy 10 | Lec 9 | NBF | FBISE

Background Radiation, Natural & Artificial | Ch 21 NUCLEAR PHYSICS | Phy 10 | Lecture 9 | National Book Foundation | Federal Board This lecture explains Background Radiation from Chapter 21 Nuclear Physics (Class 10 Physics, National Book Foundation, Federal Board). Background radiation refers to the ionizing radiation that is always present around us, coming from both natural and artificial sources. Every human being is exposed to low-level radiation throughout life, and understanding its types and sources is essential for board exams. We begin by discussing Natural Background Radiation. Since the beginning of time, Earth has been surrounded by natural radiation. The first major source is Cosmic Rays, high-energy particles that enter Earth from outer space. Their intensity changes with altitude and the strength of Earth’s magnetic field—higher areas receive more cosmic radiation. The second major source is Terrestrial Radiation, which comes from radioactive elements naturally present in soil, rocks, and water. Elements such as uranium, thorium, and potassium-40 continuously decay and release radiation. A major component of terrestrial radiation is Radon Gas, produced from radioactive decay in Earth’s crust. Radon enters homes, especially basements, and is the leading cause of lung cancer in non-smokers. Other contributors include radioactive rocks, building materials, and even food and drink, since plants and animals contain small amounts of potassium-40 and carbon-14. The third natural component is Internal Radiation. Our own bodies contain trace amounts of natural radioactive elements including potassium-40 and carbon-14. These isotopes release tiny amounts of radiation and contribute to our total exposure. We then explore Artificial Background Radiation, which results from human activities. One major source is Medical Radiation from X-rays, CT scans, and radiation therapy. These procedures are extremely useful but add to a person’s radiation dose. Another source is Industrial Radiation, such as emissions from nuclear power plants, radioactive materials used in factories, and devices like smoke detectors. Although typically low, exposure can be higher near industrial sites. The last source is Fallout Radiation, produced during nuclear weapons tests and nuclear accidents like Chernobyl and Fukushima. Fallout settles in the environment and contributes slightly to present-day radiation levels. This lecture helps students understand the origin, types, and impact of background radiation, along with the differences between natural and artificial sources. It is extremely important for board exam preparation and conceptual clarity in Nuclear Physics. Hashtags #Class10Physics #NuclearPhysics #BackgroundRadiation #NaturalRadiation #ArtificialRadiation #FBISE #NBF #CosmicRays #TerrestrialRadiation #RadonGas #MedicalRadiation #IndustrialRadiation #FalloutRadiation #PhysicsLecture #BoardExamPrep Background radiation,Natural radiation,Artificial radiation,Class 10 Physics,Nuclear Physics chapter 21,FBISE,NBF physics,Radon gas,Cosmic rays,Terrestrial radiation,Internal radiation,Medical radiation,Industrial radiation,Nuclear fallout,Radioactive sources,Physics lecture Pakistan,Board exam preparation,Environmental radiation,Types of radiation,Class 10 chapter 21