Understanding India's Radioactive Metal Reserves

This question asks about which radioactive metal India holds the world's largest reserves. Radioactive metals are important for various applications, including nuclear energy generation.

Let's look at the options provided:

• Uranium ($\text{U}$)
• Radium ($\text{Ra}$)
• Bismuth ($\text{Bi}$)
• Thorium ($\text{Th}$)

Analyzing India's Radioactive Metal Reserves

India is known to have significant reserves of several minerals and metals. When considering radioactive metals and global reserves, Thorium ($\text{Th}$) stands out for India.

India possesses vast reserves of Thorium, primarily found in the monazite sands along its coastal areas. These reserves are estimated to be the largest in the world. Thorium is considered a potential future fuel source for nuclear reactors, and India has been researching and developing technologies to utilize its large Thorium reserves effectively for nuclear energy.

Let's briefly consider the other options:

• Uranium ($\text{U}$): India does have Uranium reserves, but they are not considered the largest in the world. India imports a significant amount of Uranium to meet its nuclear energy needs.
• Radium ($\text{Ra}$): Radium is a highly radioactive element found in trace amounts in Uranium ores. While present, India is not known to have the world's largest reserves of Radium.
• Bismuth ($\text{Bi}$): Bismuth is not typically considered a major radioactive metal in the context of large-scale energy reserves, although some isotopes of Bismuth are radioactive. India's Bismuth reserves are not the largest globally.
• Thorium ($\text{Th}$): As mentioned, India is widely recognized for having the world's largest known reserves of Thorium.

Conclusion on Radioactive Reserves in India

Based on global geological surveys and resource assessments, India has the world's largest reserves of Thorium. This makes Thorium a strategically important element for India's energy future.

The final answer is indeed Thorium.

Revision Table: India's Key Radioactive Metals

Additional Information: Thorium and India's Nuclear Program

India's large Thorium reserves have led to the development of a unique three-stage nuclear power program. The goal is to eventually transition from Uranium-based reactors to reactors that can effectively utilize Thorium as a fuel. This program aims to ensure energy security for India by leveraging its abundant domestic Thorium resources.

Thorium is fertile, meaning it can be converted into a fissile isotope (Uranium-233, $\text{U}-233$) through neutron absorption. This $\text{U}-233$ can then be used as fuel in subsequent reactor stages.

Monazite sand, the primary source of Thorium in India, is a mineral containing various rare earth elements and about 8-10% Thorium oxide ($\text{ThO}_2$). These sands are found along the coastlines, particularly in states like Kerala, Tamil Nadu, and Odisha.