After gamma emission or internal conversion, the resulting ground-state technetium-99 then decays with a half-life of 211,000 years to stable ruthenium-99. This process emits soft beta radiation without a gamma.
How is technetium-99m used in healthcare?
Technetium (Tc-99m) is an isotope commonly used in a number of medical diagnostic imaging scans. Tc99m is used as a radioactive tracer for nuclear medicine; which is a form of medical imaging that assesses how particular parts of our body are working or functioning.
How does radioactive decay work in medicine?
Diagnostic techniques in nuclear medicine use radioactive tracers which emit gamma rays from within the body. These tracers are generally short-lived isotopes linked to chemical compounds which permit specific physiological processes to be scrutinized. They can be given by injection, inhalation, or orally.
Why is technetium-99m used as a medical tracer?
Tc-99 m is ideal as a medical tracer because the gamma radiation it emits allows the medical practitioner to image internal body organs causing hardly any radiation damage to the patient. Approximately 85% of diagnostic imaging procedures in nuclear medicine use this isotope.
How does Mo 99 decay?
Mo-99 decays by emitting a beta particle (an electron). About 88 percent of the decays (red line) produce Tc-99m, which subsequently decays to the ground state, Tc-99g, by emitting a gamma ray.
How does a tc99m Generator work?
Tc-99m is radioactive because one or more of the protons and neutrons in its nucleus is in an excited state. Tc-99m decays into Tc-99 with a half-life of six hours and this makes it particularly well suited to use in the body: after one day (four half-lives) only 6.3% of the initial Tc-99m remains.
How many decay particles does Tc have?
One gram of 99Tc produces 6.2×108 disintegrations a second (that is, 0.62 GBq/g). Technetium has no stable or nearly stable isotopes, and thus a standard atomic weight cannot be given.
Why gamma radiation is used in medical treatment?
Gamma rays are also used for sterilization of medical equipment. Gamma rays easily pass through the packaging of medical equipment (can only be stopped by thick lead) and kill living tissue such as viruses and bacteria. Gamma rays can be produced by several processes that are both nuclear and non-nuclear.
How is technetium-99m produced in hospitals?
Hospitals cannot run their own nuclear reactors and so they rely on technetium generators – machines that produce Tc-99m from the decay of its parent isotope molybdenum-99. Once Mo-99 has been produced it is placed into a technetium generator and these generators are transported to hospitals.
Is technetium-99m1 used in medical procedures?
The decay product of Mo-99, technetium-99m1(Tc-99m), is used in about two-thirds2of all diagnostic medical isotope procedures in the United States. 2. Between 95 and 98 percent of Mo-99 is currently being produced using highly enriched uranium (HEU) targets (NNSA and ANSTO, 2007), which was the major concern of Congress when it mandated this study.
How long does it take to decay technetium 99m?
Technetium-99m. This is extremely long for an electromagnetic decay – more typical is 10 -16 seconds. With such a long half-life for the excited state leading to this decay, this state is called a metastable state, and that is the reason for the designation 99m. Some aspects of the complex decay of this radioisotope are shown in the diagram below.
What is Tc 99m used for in medicine?
MOLYBDENUM-99 USE IN NUCLEAR MEDICINE The decay product of Mo-99, Tc-99m, is the workhorse isotope in nuclear medicine for diagnostic imaging. Tc-99m is used for the detection of disease and for the study of organ structure and function.
What is the decay product of Mo-99?
The decay product of Mo-99, Tc-99m, is the workhorse isotope in nuclear medicine for diagnostic imaging. Tc-99m is used for the detection of disease and for the study of organ structure and function.
