RADIATION DOSIMETRY WITH FLUORODS. Miniature Glass Rod Dosimetry
The fluorod (a silver-activated phosphate glass rod) is a tiny dosimeter whose fluorescence following ionizing irradiaation is proportional to the dose. Its potential usefulness in clinical radiation therapy, due to its small size (1 x 6 mm), prompted a physical and clinical investigation of its dosimetric properties. Following exposure to radiation, the fluorod is positioned in a fluorimeter and its fluorescence under altraviolet light is measured. The fluorod has the following dosimetric properties when exposed to 2-Mvp x rays; the response is linear to dose up to at least 8,000 r; it is independent of temperature at the time of exposure; it is independent of the direction of the incident beam of radiation in a scattering material; the fluorescence fades very slowly over a period of many months; the background fluorescence is approximately 80 to 100 r, making the fluorod useful for experimental or clinical doses above 200 r; heat treatment for approximately five hours at 400 deg C reduces the dose effect to background level so that the fluorod can be used again. Because of energy dependence, fluorods should be used only for energies higher than 400-kvp x rays. They are particularly useful forr supervoltage x rays and radium and Co/ sup 60/ gamma-ray dose measurements. The dose responses to radioisotope beta rays in solution and high-energy betatron electron beams were determined. Pilot dosimetry in phantoms and patients showed potential clinical usefulness of the fluorod. Problems such as tangential beam dosimetry, measurements of tumor dosage in body cavities, and dose measurements close to Co/sup 60/ topical applicators were studied in particular. (auth)
- Research Organization:
- Hospital for Joint Diseases, New York; Veterans Administration Hospital, Boston
- NSA Number:
- NSA-14-002579
- OSTI ID:
- 4230266
- Journal Information:
- Radiology (U.S.), Vol. Vol: 73; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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BACKGROUND
BEAMS
BETA PARTICLES
BODY
DOSEMETERS
EFFICIENCY
ELECTRON BEAMS
ENERGY
FLUORESCENCE
FLUOROMETRY
GAMMA RADIATION
GLASS
HEAT TREATMENTS
INSTRUMENTS
MEASURED VALUES
MOCKUP
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ULTRAVIOLET RADIATION
X RADIATION