Explain how nuclear radiation are used in detecting underground water pipes leakage?

Step 1: Introduce a radioactive tracer into the water system. A small, safe amount of radioactive isotope (e.g., iodine-131 or tritium-labeled water) is injected into the water flowing through the underground pipes. This tracer mixes uniformly with the water. Step 2: Allow time for distribution. The water (with tracer) flows through the pipes, ensuring any potential leak sites are exposed to the tracer. Step 3: Scan the surface with a radiation detector. A portable radiation detector, such as a Geiger-Müller counter or scintillation detector, is moved systematically over the ground surface above the suspected pipe route. Step 4: Detect elevated radiation levels. Where a leak occurs, tracer-laden water seeps into the soil, creating localized spots of higher radioactivity. The detector registers increased radiation counts per minute (cpm) at these points. Step 5: Pinpoint and confirm the leak. The exact location is marked by peak readings. Further tests (e.g., pressure tests or excavation) confirm the leak. The short half-life of tracers ensures quick decay and minimal environmental impact.