Medical Applications

Nuclear medicine is a specialized medical field that employs radioactive substances, known as radioisotopes or radionuclides, for both diagnosing and treating diseases. Unlike anatomical imaging, it provides insights into physiological function and molecular processes.

The core mechanism involves administering a radiopharmaceutical, which is a radioisotope tagged to a specific molecule, into the body. This compound targets particular organs or tissues, emitting radiation (gamma rays, positrons, or beta/alpha particles) that can be detected externally or used for localized therapy.

Diagnostic applications primarily utilize gamma-emitting isotopes like Technetium-99m (Tc-99m) for SPECT scans (e.g., bone, cardiac, renal imaging) or positron-emitting isotopes like Fluorine-18 (F-18) for PET scans (e.

g., cancer detection, neurological studies). These techniques offer functional images, revealing disease at early stages or assessing treatment response. India's BARC and BRIT are crucial for indigenous production and supply of these isotopes, with medical cyclotrons increasingly installed for short-lived PET tracers.

Therapeutic applications, often for cancer, use isotopes that emit destructive beta or alpha particles. Examples include Iodine-131 (I-131) for thyroid cancer and hyperthyroidism, and Lutetium-177 (Lu-177) for neuroendocrine and prostate cancers. These therapies deliver targeted radiation, minimizing damage to healthy tissues. External beam radiotherapy (teletherapy) using Cobalt-60 and brachytherapy (internal radiation) are also vital components.

Safety and regulation are paramount, overseen by the Atomic Energy Regulatory Board (AERB) in India. AERB ensures strict adherence to radiation protection protocols, waste management, and licensing, safeguarding patients, staff, and the environment.

Recent advances like theranostics, which integrate diagnosis and therapy, and the expansion of indigenous production capabilities underscore the dynamic and critical role of nuclear medicine in India's healthcare landscape and its 'Atmanirbhar Bharat' vision.