means radiation that is being emitted in close
proximity to or inside the cancer tumor. It is also referred to as "implant
the time in which one half of the atoms of a particular
radioactive substance disintegrates into another nuclear form. Half-lives vary
from millionths of a second to billions of years.
small radioactive seeds are implanted in or near the
cancer lesions. Seeds may be implanted permanently or temporarily depending on
the type of cancer being treated.
unit of radiation dose. It is the product of the absorbed dose
(i.e., the amount of energy imparted in the body) and a quality factor for the
type of ionizing radiation being measured.
particles or photons emitted from the nucleus of unstable
radioactive atoms as a result of radioactive decay Also, it refers to x-rays
emitted by an x-ray machine.
deposition of radioactive material in any
place where it could potentially be harmful to individuals.
decrease in the amount of any radioactive material
with the passage of time due to the spontaneous emission of radiation from an
an unstable isotope of an element that decays or
disintegrates spontaneously, emitting radiation.
Radiopharmaceutical therapy (capsule or liquid therapy)
have had their thyroid removed because of cancer typically undergo this
treatment. Radioactive I-131 capsules or liquid is administered to a patient
orally. The I-131 enters the bloodstream and is "taken up" by any
remaining thyroid cancer cells. The radiation from the I-131 will destroy these
remaining cancer cells. Another type of
treatment is radiolabeled antibody therapy. Patients undergoing treatment
for lymphoma or leukemia are administered I-131 labeled antibodies
intravenously, and will remain in radiation isolation for a much longer
period of time than the thyroid cancer patients
Remaining I-131 is eliminated via the urine, feces and
other bodily fluids.
small metal sources containing radioactive material. Seeds are
made of radioactive material which is sealed and doubly encapsulated in metal.