I-125, A NEW RADIOISOTOPE FOR THE LABELED HIPPURAN RENOGRAM

Journal Article · Sun Jul 01 04:00:00 EDT 1962 · Journal of Urology (U.S.)

OSTI ID:4755394

Winter, C C; Myers, W G

making radioisotope renograms. Its long half-life of 60 days is convenient, and it emits low-energy 27.2-35.4kev photons that are inherently directional because about half of them are absorbed by the all-or-none photoelectric process. They are readily absorbed by brass, steel, or thin lead foils. This makes it simple to shield against them and to achieve effective collimation of them by much lighter and less bulky apparatus than is required with I/sup 131/ The soft I/sup 125/ photons are absorbed efficiently in thincrystal scintillation detectors that have much lower background counting rates than those used previously for making renograms with hippuran-I/sup 131/. I/sup 125/ does not emit useless and undesirable BETA -particles; consequently, the photon merit ratio (usable photons/absorbed energy) is high. Radiation exposures to the patient are lowered when I/sup 125/ replaces I/sup 131/. Risk of decomposition due to selfirradiation of photon carrier compounds is decreased when I/sup 125/ is used to label them. (H.H.D.)

• Research Organization: Ohio State Univ., Columbus
• NSA Number: NSA-17-005728
• OSTI ID: 4755394
• Journal Information: Journal of Urology (U.S.), Journal Name: Journal of Urology (U.S.) Vol. Vol: 88; ISSN JOURA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BACKGROUND
BIOLOGY AND MEDICINE
BRASS
COPPER ALLOYS
CRYSTALS
DIAGNOSIS
ENERGY LEVELS
HALF-LIFE
HIPPURAN
HIPPURIC ACID
IODINE 125
KIDNEYS
LEAD
MAN
PHOTONS
RADIATION EFFECTS
SCINTILLATION COUNTERS
SHIELDING
SODIUM COMPOUNDS
STEELS
TRACER TECHNIQUES
ZINC ALLOYS