I do not have the decay constant but, by using the half-life information, I can find it.(Since this is a decay problem, I expect the constant to be negative.The name originates from the Greek word 'technetos' meaning artificial! In order for that nucleus go to a more stable state it has to give out the excess energy, it does this by emitting a gamma ray.The common isotope of technetium is Tc-98, but it is the metastable isotope of Tc-99 that is most sought after - Tc-99. Tc-99 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.If you're seeing this message, it means we're having trouble loading external resources on our website.
Approximately 85% of diagnostic imaging procedures in nuclear medicine use this isotope.The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.For instance, a small amount of carbon exists in the atmosphere as radioactive carbon-14, and the amount of carbon-14 found in fossils allows paleontologists to determine their age.Atoms of each element contain a characteristic number of protons.