The use of carbon minus loaded thermoluminescent dosimeters for the measurement of surface doses in megavoltage x-ray beams

Journal Article · Wed Nov 01 00:00:00 EST 1989 · Medical Physics; (USA)

DOI:https://doi.org/10.1118/1.596315· OSTI ID:5257985

Thomas, S J; Palmer, N ^[1]

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1. Medical Physics Department, Addenbrooke's Hospital, Cambidge CB2 2QQ, United Kingdom (GB)

To determine the absorbed dose to the skin of patients undergoing radiotherapy with megavoltage radiations, it is necessary for the dose to be measured at shallow depths. This report assesses the suitability of carbon-loaded thermoluminescent dosimetry (manufactured by Vinten Instruments Limited) for this purpose. Measurements have been made of the effective measurement depth of the dosimeters, the linearity with dose, and the variation of sensitivity within a batch. The variation of surface dose with incident angle of radiation for 5-MV x rays has been measured using these disks; the results are compared with results obtained using a thin-windowed ionization chamber.

• OSTI ID: 5257985
• Journal Information: Medical Physics; (USA), Vol. 16:6; ISSN 0094-2405
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
GAMMA DOSIMETRY
GAMMA RADIATION
SKIN ABSORPTION
THERMOLUMINESCENT DOSEMETERS
SENSITIVITY
X RADIATION
X-RAY DOSIMETRY
RADIATION DOSES
RADIOTHERAPY
ABSORPTION
DOSEMETERS
DOSES
DOSIMETRY
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MEDICINE
NUCLEAR MEDICINE
RADIATIONS
RADIOLOGY
THERAPY
UPTAKE
440102* - Radiation Instrumentation- Radiation Dosemeters