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• W2023450749 abstract "Preliminary measurements have been made on the x-ray beam produced by a High Voltage Engineering Corporation 6-Mev medical linear accelerator. For normal patient treatments, the unit is operated at 400 pulses per second and about 80 µ amp. electron beam current, giving a peak dose rate, after field flattening, of 225 rad/min. at 100 cm. TSD. For x-ray production, a gold transmission target is used, with a focal spot of 1 mm. diameter. Due to the small focal spot and the arrangement of the collimator, there is negligible variation of dose rate with field size: less than 1 per cent up to 20 × 20 cm. and 1.5 per cent at 25 × 25 cm. The collimator consists of two pairs of lead blocks, 4.5 inches thick, which move on arcs of circles, so that their edges are always parallel to the edges of the beam. A flattening filter gives a field flatness in air of ± 1 per cent out to 90 per cent of the field width. The field edge coincides with the 50 per cent isodose contour. Narrow beam absorption measurements show a h.v.l. of 12.5 mm. Pb. The peak dose occurs at 1.5 cm. beneath the skin surface. As would be expected, back-scatter factors are low, with a maximum of 1.035 for a 25 × 25-cm. field. Initial calibration of the absorbed dose from the x-ray beam was made with the Fricke ferrous sulfate dosimeter. The dosimeter solution was irradiated in small polyethylene bottles in a water phantom. Calculation of absorbed dose from readings of a Victoreen 250-r chamber in the water phantom agreed with the ferrous sulfate results within 2 per cent. A Co60 calibration factor was used. As a result, the Victoreen chamber is employed for routine calibration of the accelerator. An ionization chamber in the accelerator head indicates both total dose delivered and dose rate on meters on the control panel. The total dose meter is provided with a meter relay for automatic shut-off at any desired dose. This is used to control the patient's treatments. The calibration is checked weekly with the Victoreen chamber. Isodose curves for the x-ray beam were measured by a photographic film technic in a unit density Masonite phantom. The film used was Kodak Translite, which showed linearity with dose up to a net density of about 2.0. The film was calibrated using depth-dose data measured by an ionization chamber in the Masonite phantom. Both experimental and calibration films were exposed with the film in a plane parallel to the direction of the beam. To eliminate errors due to variations in processing, a calibration film was exposed and developed along with each set of experimental films. A complete calibration curve was plotted from the calibration film, which was then used to obtain the isodose data." @default.
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• W2023450749 date "1963-01-01" @default.
• W2023450749 modified "2023-10-08" @default.
• W2023450749 title "X-Ray Beam Measurements on a 6-Mev Linear Accelerator" @default.
• W2023450749 doi "https://doi.org/10.1148/80.1.116a" @default.
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