:Find the correct statement . 20 The radionuclide most commonly used is barium The radionuclide most commonly used is technetium -99m. The radionuclide most commonly used are iodine-containing solutions. All correct.

The correct statement is: 'The radionuclide most commonly used is technetium-99m.'<br /><br />Technetium-99m is the most commonly used radionuclide in nuclear medicine for diagnostic imaging procedures. It is preferred due to its favorable properties, such as a short half-life of approximately 6 hours, emission of gamma rays suitable for detection, and low levels of radiation emitted during the process. This makes it a safe and effective choice for various imaging techniques, including single-photon emission computed tomography (SPECT) scans.