| 摘要 |
<p>A radiotherapeutic agent consists of microspheres having diameters of no more than a few νm, formed of a denatured protein or other biodegradable (or non-biodegradable) substance and incorporating so as not to be released into a bloodstream both a ferromagnetic substance and a radioactive substance which emits short-range tissue-damaging radiation and having a half-life in the approximate range of 3 to 300 hours. In use the agent is suspended in a physiologically tolerable liquid and injected into the bloodstream of a patient when a magnetic field is applied to the patient to cause the microspheres to collect in the vicinity of a tumour where they are held while the radiation impinges on the tumour.</p> |
