The low energy of the gamma spectrum in this case limits radiation damage to tissues far from the implanted capsule.
2.
The gamma spectrum shows prominent peaks at 609, 1120, and 1764 keV, belonging to bismuth-214, a radon decay product.
3.
The annihilation peak produced in a gamma spectrum by annihilation radiation therefore has a higher full width at half maximum ( FWHM ) than other gamma rays in spectrum.
4.
The gamma spectrum is characteristic of the gamma-emitting nuclides contained in the source, just as in optical spectroscopy, the optical spectrum is characteristic of the material contained in a sample.
5.
The purpose of the lead, cadmium ( or tin ), and copper is to reduce the background in the low energy region of a gamma spectrum ( typically less than 200 keV)
6.
Iridium-192 has a lower photon energy than cobalt-60 and its gamma spectrum is complex ( many lines of very different energies ), but this can be an advantage as this can give better contrast for the final photographs.
7.
Iodine-125, due to its suitable longer half-life and less penetrating gamma spectrum, is also often preferred for laboratory tests that rely on iodine as a tracer that is counted by a gamma counter, such as in radioimmunoassaying.
8.
The gamma spectrum shown in Figure 2 is of the cobalt isotope, with two gamma rays with 1.17 MeV and 1.33 MeV respectively . ( " See the decay scheme article for the decay scheme of cobalt-60 . " ) The two gamma lines can be seen well-separated; the peak to the left of channel 200 most likely indicates a strong background radiation source that has not been subtracted.
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