Citation Hunt

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Gadolinium-153 is produced in a nuclear reactor from elemental europium or enriched gadolinium targets. It has a half-life of 240±10 days and emits gamma radiation with strong peaks at 41 keV and 102 keV. It is used in many quality-assurance applications, such as line sources and calibration phantoms, to ensure that nuclear-medicine imaging systems operate correctly and produce useful images of radioisotope distribution inside the patient.^[1] It is also used as a gamma-ray source in X-ray absorption measurements and in bone density gauges for osteoporosis screening.^{[citation needed]}

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