In which of the following fields is radioisotopes not used?

Radioisotopes are not used in weather forecast. Radioisotopes are isotopes (variants of chemical elements) that have unstable nuclei, which means they spontaneously decay and emit radiation in the form of particles or energy. These radioactive properties make them useful in various fields. In medicine, radioisotopes are used in a variety of ways, including for imaging and diagnosis of diseases and in radiation therapy for cancer treatment. In the oil industry, radioisotopes are used to determine the porosity and permeability of rocks and to locate oil reserves. In agriculture, radioisotopes are used to study plant metabolism and nutrient uptake, and to control pests and diseases. However, radioisotopes are not used in weather forecast. Weather forecasting relies on various types of data, including atmospheric pressure, temperature, humidity, and wind speed and direction, which are collected using weather instruments and analyzed using computer models. Radioisotopes do not play a role in this process.