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99mTc decays mainly by gamma emission, about 98.6% of these gamma decays result in 140.5 keV gamma rays. The remaining 1.4% are gammas of a slightly higher energy at 142.6 keV. These radiations are picked up by the gamma camera when 99mTc is used as a radioactive tracer. In medical centres, the 99mTc is produced from the decay of 99Mo trapped on a 99Mo/99mTc generator.
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Test |
Technic/instrument |
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Appearance |
Visual |
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Radionuclidic Identity |
Gamma-ray spectroscopy with Multichannel analyser (MUCHA) |
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pH |
pH-meter or pH strips with reading through a reflexion photometer |
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Aluminium |
Colorimetric test |
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Radiochemical purity (99mTc-Pertechnate ion) |
Gamma-radio-TLC |
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Radionuclidic purity : preliminary test (with a shield of lead), iodine-131, Molybdenium-99, Ruthenium-103, Strontium-89 |
Gamma-ray spectroscopy with Multichannel analyser |
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Sterility |
Compendial method |
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Radioactivity |
Dose calibrator |