Unsealed source radiotherapy relates to the use of soluble forms of radioactive substances which are administered to the body by injection or ingestion. Such substances are typically used for their biological properties, which are similar to their non-radioactive parent substance.
Sealed-source therapy, in which the radioisotope remains in a capsule or metal wire during therapy and is never allowed to dissolve in fluids, is usually referred to as brachytherapy
A review of the subject was published in 1999 by Wynn A. Volkert and Timothy J. Hoffman.
Read more about Unsealed Source Radiotherapy: Iodine, Other Unsealed Sources, Experimental Antibody Based Methods - Alpha Emitters
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“We are threatened with suffering from three directions: from our own body, which is doomed to decay and dissolution and which cannot even do without pain and anxiety as warning signals; from the external world, which may rage against us with overwhelming and merciless forces of destruction; and finally from our relations to other men. The suffering which comes from this last source is perhaps more painful than any other.”
—Sigmund Freud (1856–1939)