Radioactivity and Quantum Physics: Core Concepts Explained

The Dawn of Radioactivity

At the end of the nineteenth century, two astonishing discoveries in the field of physics sparked a scientific revolution: X-rays and radioactivity. While Henri Becquerel was studying fluorescence, Wilhelm Roentgen discovered X-rays. The source of this radiation lies in the nuclei of uranium atoms, which undergo a process of transformation or disintegration into other chemical elements, releasing large amounts of energy in the form of radioactive rays.

Nuclear Processes

• Nuclear Fission: The splitting of a heavy atomic nucleus into two intermediate nuclei.
• Nuclear Fusion: The combining of two atomic nuclei to form a heavier nucleus.

Marie Curie and her husband, Pierre Curie, discovered two new chemical elements—radium and polonium—which were significantly more active than uranium. This discovery paved the way for identifying many more radioactive elements.

Types of Radioactivity

There are three primary types of radioactivity. Beyond natural radioactive emissions (alpha, beta, and gamma rays), substances can also exhibit artificial radioactivity. Ernest Rutherford published the results of the first artificial nuclear reaction. While natural radioactivity is a spontaneous process, artificial radioactivity occurs as a result of induced nuclear interactions.

Nature of Radioactive Rays

• Beta rays: High-speed electrons.
• Alpha rays: Positive ions of helium atoms.

These discoveries led to significant applications, ranging from military uses like nuclear bombs to peaceful advancements in medicine.

Advancements in Quantum Physics

Since 1950, a new line of research has improved our understanding of the atomic core and revealed new subatomic particles. Scientists utilize particle accelerators to accelerate particles for use as projectiles to probe the innermost core of matter.

The World of Quarks

In 1964, Murray Gell-Mann proposed that, alongside electrons, there is a small number of basic entities called quarks. These include:

• Up / Down
• Top / Bottom
• Charm / Strange

Quantum Physics in Modern Life

Quantum physics currently contributes to 30% of global GDP through technologies such as:

• Lasers (TDT, DVD, video)
• LED displays
• Computing
• Quantum cryptography