12.3 Impact of Using Nuclear Energy
The use of nuclear energy must be properly regulated to safeguard mankind and the environment. While nuclear technology offers significant applications, its weaponisation and testing have caused catastrophic historical destruction, severe environmental contamination, and lasting biological harm through radiation spread.
Learning Objectives
- Describe the historical impact of nuclear weapons on human lives and the environment.
- Explain the purpose of conducting nuclear tests and their adverse environmental impacts.
- Differentiate between somatic effects and genetic effects caused by radiation spread.
- State the role of international treaties such as the Nuclear Nonproliferation Treaty (NPT) in regulating nuclear weapons.
Effects of Radiation Spread: Somatic vs Genetic Effects
Radiation from nuclear tests damages the exposed individual and can also affect future generations.
Short Explanation
Nuclear weapons and their impact
Nuclear weapons utilise tremendous amounts of energy released from fission processes. When detonated, the immense thermal energy and shock waves cause immediate mass casualties, structural melting, and widespread radioactive fallout.
Early research on nuclear energy began in the 1940s to produce the atomic bomb. Plutonium, a byproduct of nuclear fission in nuclear reactors, was used to make the atomic bomb. J. Robert Oppenheimer is recognised as the "Father of the Atomic Bomb" after inventing it, though he later expressed regret after witnessing the explosion's devastation.
Atomic bombings of Hiroshima and Nagasaki
The atomic bomb "Little Boy" was dropped on Hiroshima on 6 August 1945. The atomic bomb "Fat Man" was dropped on Nagasaki on 9 August 1945. The nuclear explosion created a powerful shock wave that immediately killed approximately 70,000 civilians. The intense blast heat caused the entire city to heat up to the point that steel structures began to melt. Communication systems throughout the city were completely cut off. The surrounding environment was devastated by the shock wave and radioactive fallout.
International regulation
The Nuclear Nonproliferation Treaty (NPT) is an international agreement established to control and prohibit countries from using nuclear weapons arbitrarily.
Impact of Nuclear Tests
Nuclear tests are conducted to verify weapon function, but they contaminate the environment.
Nuclear tests are conducted to determine whether nuclear weapons function properly before they are deployed. Tests are carried out in the open atmosphere, on land, or underwater.
| Testing environment | Environmental impact |
|---|---|
| Underground tests | Cause radiation contamination to soil and water sources. |
| Sea tests | Lead to destruction of aquatic life and severe marine pollution. |
| Land and atmospheric spread | Expose humans and other living things to harmful radiation. |
Biological effects of radiation spread
Radiation exposure impacts living organisms in two distinct ways: somatic effects and genetic effects.
Somatic effects
Damage occurring directly to the exposed individual's body: tiredness, nausea, cataract, leukaemia, and hair loss.
Genetic effects
Damage occurring to genetic material affecting future generations: deformation in babies, cell mutation, and cancer.
Try to Answer First
Answer in your mind, then press "Check Answer".
What was the primary purpose of early nuclear energy research conducted in the 1940s?
Why are nuclear tests conducted?
Give two examples of somatic effects and two examples of genetic effects caused by radiation.
Common Mistakes
- Confusing somatic effects with genetic effects. For example, classifying hair loss as a genetic effect instead of a somatic effect.
- Swapping the names and target locations of the two WWII atomic bombs. "Little Boy" was dropped on Hiroshima, while "Fat Man" was dropped on Nagasaki.
- Thinking nuclear tests are conducted solely to dispose of excess nuclear materials, rather than to verify if weapons function.
Concept Misunderstandings
All biological effects of radiation only show up in future generations.
Radiation causes both somatic effects, such as cataracts, hair loss and nausea, and genetic effects that cause deformities in offspring and cell mutations.
The Nuclear Nonproliferation Treaty (NPT) allows any nation to test and detonate nuclear weapons freely.
The NPT strictly controls and prohibits nations from manufacturing, acquiring, or using nuclear weapons arbitrarily.
Summary
- Nuclear weapons developed in the 1940s used byproducts like plutonium from nuclear fission.
- The bombings of Hiroshima ("Little Boy", 6 August 1945) and Nagasaki ("Fat Man", 9 August 1945) demonstrated the catastrophic destruction of shock waves, extreme heat, and radioactive fallout.
- Nuclear tests verify weapon functionality but contaminate soil, water, and marine life.
- Radiation causes somatic effects (tiredness, nausea, cataract, leukaemia, hair loss) and genetic effects (cell mutation, deformation in babies, cancer).
- The Nuclear Nonproliferation Treaty (NPT) controls and limits arbitrary weapon proliferation.
Short Activity
A. Objective Quiz
1 Which atomic bomb was dropped on Hiroshima on 6 August 1945?
2 Which of the following is classified as a somatic effect of radiation exposure?
B. Fill in the Blanks
3 Nuclear tests done underground will cause radiation effects to soil and sources.
4 Countries are bound by the Nonproliferation Treaty (NPT) to prevent arbitrary nuclear weapon use.
C. Drag and Drop: Match Each Radiation Effect to Its Category
Drag each radiation effect to the correct classification. On a phone, tap an answer first, then tap a matching box. Tap the Answer Choices area to return a selected item.
C. Match Each Radiation Effect to Its Category
Write the correct radiation effect next to each classification.
| Classification | Radiation Effect |
|---|---|
| 1. Somatic effect affecting vision in an exposed individual | |
| 2. Genetic effect passed on to offspring | |
| 3. Somatic effect involving the blood system | |
| 4. Genetic effect altering the structure of cellular DNA |
Answer choices: Cataract • Deformation in babies • Leukaemia • Cell mutation
