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Thorium: Properties, Abundance, and Fissionability for UPSC - UPSC Science And Technology
What is Thorium: Properties, Abundance, and Fissionability for UPSC in UPSC Science And Technology?
Thorium: Properties, Abundance, and Fissionability for UPSC is a key topic under Science And Technology for UPSC Civil Services Examination. Key points include: Thorium is a silvery, slightly radioactive metal, three times more abundant than uranium.. It is commonly found in igneous rocks and heavy mineral sands, with India having significant reserves.. Thorium-232 is fissionable (can undergo fission) but not fissile (cannot sustain a chain reaction without external neutrons).. Understanding this topic is essential for both UPSC Prelims and Mains preparation.
Why is Thorium: Properties, Abundance, and Fissionability for UPSC important for UPSC exam?
Thorium: Properties, Abundance, and Fissionability for UPSC is a Medium-level topic in UPSC Science And Technology. It is tested in both Prelims (factual MCQs) and Mains (analytical answer writing). Previous year UPSC questions have frequently covered aspects of Thorium: Properties, Abundance, and Fissionability for UPSC, making it essential for comprehensive IAS preparation.
How to prepare Thorium: Properties, Abundance, and Fissionability for UPSC for UPSC?
To prepare Thorium: Properties, Abundance, and Fissionability for UPSC for UPSC: (1) Study the comprehensive notes covering all key concepts on Vaidra. (2) Practice previous year questions on this topic. (3) Connect it with current affairs using daily updates. (4) Revise using key takeaways and mind maps available for Science And Technology. (5) Write practice answers linking Thorium: Properties, Abundance, and Fissionability for UPSC to related GS Paper topics.
Key takeaways of Thorium: Properties, Abundance, and Fissionability for UPSC for UPSC
- Thorium is a silvery, slightly radioactive metal, three times more abundant than uranium.
- It is commonly found in igneous rocks and heavy mineral sands, with India having significant reserves.
- Thorium-232 is fissionable (can undergo fission) but not fissile (cannot sustain a chain reaction without external neutrons).
- It requires high-energy neutrons to fission and can be converted to fissile Uranium-233.
- Thorium is crucial for India's three-stage nuclear power program for long-term energy security.
Thorium: Properties, Abundance, and Fissionability for UPSC
Medium⏱️ 7 min read
science and technology
📖 Introduction
Introduction to Thorium
Thorium is a naturally occurring, slightly radioactive metal. It presents a silvery appearance and is found in various geological formations.
Key Property: Thorium is a radioactive metal, meaning its atoms undergo spontaneous decay, emitting radiation.
Occurrence and Distribution
This metal is commonly present in igneous rocks, which are formed from the cooling of molten magma or lava. It is also found in significant concentrations within heavy mineral sands, often alongside other valuable minerals.
Common Locations: Found in igneous rocks and heavy mineral sands globally.
Global Abundance Compared to Uranium
Thorium is considerably more abundant in the Earth’s crust than uranium, a more commonly known nuclear fuel. Its average concentration is significantly higher.
Abundance Data:
- Thorium: Approximately 10.5 parts per million (ppm) in the Earth's crust.
- Uranium: Approximately 3 ppm in the Earth's crust.
This indicates that thorium is about three times more abundant than uranium.
Fissionable but Not Fissile Nature
The only naturally occurring isotope of thorium is Thorium-232. This isotope possesses a unique characteristic: it is fissionable but not fissile.
Understanding the Distinction:
- Fissionable: An atomic nucleus that can undergo fission (splitting into smaller nuclei) when struck by a neutron.
- Fissile: An atomic nucleus that can sustain a nuclear chain reaction when struck by a thermal neutron (low-energy neutron).
While Thorium-232 can undergo fission, it cannot sustain a chain reaction on its own without external neutron assistance. It specifically requires high-energy neutrons to initiate and continue the fission process effectively.
UPSC Insight: The distinction between fissionable and fissile is crucial for understanding nuclear energy and India's three-stage nuclear power program, which aims to utilize thorium.
💡 Key Takeaways
- •Thorium is a silvery, slightly radioactive metal, three times more abundant than uranium.
- •It is commonly found in igneous rocks and heavy mineral sands, with India having significant reserves.
- •Thorium-232 is fissionable (can undergo fission) but not fissile (cannot sustain a chain reaction without external neutrons).
- •It requires high-energy neutrons to fission and can be converted to fissile Uranium-233.
- •Thorium is crucial for India's three-stage nuclear power program for long-term energy security.
🧠 Memory Techniques
98% Verified Content
📚 Reference Sources
•International Atomic Energy Agency (IAEA) publications on Thorium Fuel Cycle
•Department of Atomic Energy (DAE), Government of India reports
•NCERT Science textbooks (Class 10, 12 for basic atomic structure and radioactivity)