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U-235 decays to Pb-207 with a half-life of 704 million years.

Due to its long half-life, U-235 is the best isotope for radioactive dating, particularly of older fossils and rocks. The half-life of C-14, however, is only 5,730 years.

Internal radiation therapy of liver cancer (C), monoclonal antibodies (C), Hodgkins disease, and hepatoma (C), cellular dosimetry, treating rheumatoid arthritis, treating breast cancer, treatment of gastrointestinal adenocarcinomas (A). National Biomedical Tracer Facility Planning and Feasibility Study.

References: A = June 1996 Society of Nuclear Medicine (SNM) Abstracts B = Holmes, R.

After another 86 minutes, half of the 5 grams of Barium-139 would decay into Lanthanum-139; you would now have 2.5 grams of Barium-139 and 7.5 grams of Lanthanum-139.

The half-lives of certain types of radioisotopes are very useful to know.

Not only does it decay by giving off energy and matter, but it also decays at a rate that is characteristic to itself.

The rate at which a radioactive isotope decays is measured in half-life.

Because of the demand and because the half-life is only 6 hours, fresh batches of the parent isotope Molybdenum-99 must be continually produced to satisfy worldwide demand. Kalen, Jennifer Hall, Report of Meeting Held to Discuss Existing and Future Radionuclide Requirements for the National Cancer Institute [April 2008] Making Medical Isotopes [TRIUMF, 2008] Advancing Nuclear Medicine Through Innovation [National Academies, 2007] New Frontiers of Science: DOE Fueling the Future of Nuclear Medicine, DOE, Office of Biological and Environmental Research [September 2007] Radiopharmaceutical Development and the Office of Science, Prepared by a Subcommittee of the Biological and Environmental Research Advisory Committee [April 2004] Expert Panel: Forecast Future Demand for Medical Isotopes [March 1999] Our Learn More page lists some valuable resources for nuclear information on medical radioisotopes, including: Medical Applications at the Nuclear Data Section - Nuclear Data Section, International Atomic Energy Agency Charged-particle cross section database for medical radioisotope production - Nuclear Data Section, International Atomic Energy Agency Cross section database for medical radioisotope production: Production of Therapeutic Radionuclides - Nuclear Data Section, International Atomic Energy Agency Cross Sections for Emerging Isotopes - Nuclear Data Section, International Atomic Energy Agency Recommended Charged-Particle Beam Monitor Cross Sections - Nuclear Data Section, International Atomic Energy Agency There are a number of external sites with information on medical isotpes, including: Radioisotopes in Medicine American College of Radiology American Nuclear Society American Chemical Society - Division of Nuclear Chemistry and Technology Food and Drug Administration - Radiation Emitting Products International Isotopes Society National Cancer Institute Nuclear Regulatory Commission (NRC) - Advisory Committee on the Medical Uses of Isotopes Radiochemical Society Radiological Society of North America Society of Nuclear Medicine [SNM] Below we give a summary of the most prevalent nuclear medicine radioisotopes and their specific applications. Imaging of abdominal infections (C), detect Hodgkins/non-Hodgkins lymphoma (C), used with In-111 for soft tissue infections and osteomyelitis detection (C), evaluate sarcoidiodis and other granulomaous diseases, particularly in lungs and mediastiusim (C). Department of Energy Office of Energy and Environmental Research Advisory Committee (HERAC). Detection of heart transplant rejection (C), imaging of abdominal infections (C), antibody labeling (C) cellular immunology (C), used with Ga-67 for soft tissue infection detection and ostemyelitis detection (C), concentrates in liver, kidneys (C), high specific activity (C), white blood cell imaging, cellular dosimetry, myocardial scans, treatment of leukemia, imaging tumors. Bone cancer pain palliation (improves the quality of life), cellular dosimetry, treatment of prostate cancer, treatment of multiple myeloma, osteoblastic therapy, potential agent for treatment of bone metastases from prostate and breast cancer (E). Corina Fiore is a writer and photographer living in suburban Philadelphia. She worked as a staff writer for science texts and has been published in Praxis review materials for beginning teachers.As we have mentioned before each radioactive isotope has its own decay pattern.As the isotopes decay, they give off particles from their nucleus and become a different isotope.The parent isotope is the original unstable isotope, and daughter isotopes are the stable product of the decay. In the first 5,730 years, the organism will lose half of its C-14 isotopes.Fossils are collected along with rocks that occur from the same strata.These samples are carefully cataloged and analyzed with a mass spectrometer.The presentations below give overall background information on medical uses as well as some more specific information on Tc-99m and on isotopes for Positron Emission Tomography (PET) procedures. Technetium-99m is used in roughly 30 million medical imaging procedures a year -- roughly one per second -- making it the most extensively used radioisotope for medical diagnostics.

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