Radioactive equilibrium: Mo-99/Tc-99m decay characteristics November 2013 Applied Radiation and Isotopes: Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine 87, Transient Equilibrium is a condition reached when the t phys of the parent is approximately 10 times greater than the t phys of the daughter. A classic example is the Mo-99/Tc-99m Generator, where the ratio of the half-lives is 67 hr/6 hr = 11:1. During the 60 hr period, 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. Tc-99m is especially useful for nuclear medicine procedures because it can be chemically incorporated into small molecule ligands and proteins that concentrate in specific organs or tissues when injected into.
The unshielded sample is then measured on the Tc-99m setting and a ratio of Mo-99 to Tc-99m activity can be calculated. The NRC limit is 0.15 ?Ci of Mo-99 activity per 1 mCi of Tc-99m activity in the administered dose (Table 1-5). Because the half-life of Mo-99 is longer than that of Tc-99m, the ratio actually increases with time, which is rarely a problem.
RADIONUCLIDE GENERATORS & EQUILIBRIUM, Molybdenum-99/Technetium-99m Production and Use – Medical …
Molybdenum-99/Technetium-99m Production and Use – Medical …
Nuclear Laboratory 2: Radionuclide Generator, Mo-99 disintegrates to the Tc-99 excited levels by beta minus emissions. The 142 keV excited level (Tc-99m) has a half-life of 6,0067 h. At the equilibrium (t>60 h), the Tc-99m activity in relation to those of Mn-99 is: Le molybd ene 99 se d esint egre par emission b^eta moins vers les.
ELUTION EFFICIENCY OF MO-99/TC-99M GENERATORS UDC 539.1 J. L. Vu?ina Vin?a Institute of Nuclear Sciences, Laboratory for Radioisotopes, P.O.B. 57, Belgrade 11001, Yugoslavia Abstract. Elution efficiency of 99mTc from 99Mo/99mTc generators was examined in dependance on the kind of adsorbent and eluence. The generators contained either pure
