Abstract
Radioactive nuclides as 131I and 133Xe are increasingly used for both clinical diagnosis and therapeutic treatment of the patient. For example, 131I is used for the treatment of thyroid gland cancer. Otherwise, 133Xe is used in ventilation studies to assess and evaluate pulmonary function and to provide images of the lungs in both cardiac and pulmonary diseases, such as asthma, pulmonary emphysema, bronchiectasis, carcinoma of the lung, and pulmonary embolism [1,2]. Furthermore, cerebral blood flow is measured using 133Xe inhalation. In this study, the X and γ-rays emission probabilities in the decay of 131I and 133Xe were precisely measured with a calibrated Si(Li) detector. Results of this study were compared using available results in the literature. Good agreement was observed between our results and available results in the literature.
Highlights
Radioactive decay occurs as a consequence of the relative values of a number of basic nuclear parameters
The radionuclides 131I (T1/2 = 8.020 d) and 133Xe (T1/2 = 5.243 d) undergo –-decay to the excited states of 131Xe and 133Cs respectively, which further de-excite by gamma emission and the competing internal conversion process leading to X-rays or Auger electron emission
The emission probabilities for both 131I and 133Xe are compared with previously published values as shown in
Summary
Radioactive decay occurs as a consequence of the relative values of a number of basic nuclear parameters. During beta-minus decay, a neutron in an atom’s nucleus turns into a proton, an electron and an antineutrino (n p + e– + ῡe). Since an atom gains a proton during beta-minus decay, it changes from one element to another. The erroneous administration of a low amount activity in diagnostic studies may result in errors of diagnosis, whereas an excessively high activity leads to an unnecessary high dose to the patient. Both incorrect applications can delay adequate treatment, or cause discomfort and serious damage to the patient’s health 4. In view of the above, we thought worthwhile to measure the emission probabilities of different K and L X-rays together with the -rays emitted in the decays of 131I and 133Xe using a calibrated and high resolution semiconductor detector
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