The Use of Two Radioactive Isotopes
نویسندگان
چکیده
There are 2 radioactive isotopes of iron suitable for use as biological tracers. One of these, Fe59, has a half life of 47 days and emits gamma rays and low energy beta rays. The other, Fe55, has a half life of about 5 years and emits low energy x-rays only. This paper describes how these 2 isotopes are prepared for red blood cell tracer studies, how biological samples containing the radioactive iron are prepared for measurements, how the measurements are performed, and how the results are reported to collaborating medical research teams engaged in various physiological and clinical studies. Fe59 has been in use for a number of years for metabolism and red cell studies (1 to 5) and a method of preparing samples for measurement with a thin window beta ray counter has been described by Ross (6). The longer lived isotope, Fe55, on the other hand, appears not to have been used previously. Each isotope has characteristics that make it particularly useful in certain problems; the combined use of both tracers offers solutions of problems which cannot be obtained by the employment of either isotope alone.
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تاریخ انتشار 2013