The Use of an Ethylene-filled Polythene Chamber for Dosimetry of Megavoltage X-rays

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Abstract
An ionization chamber, of polythene filled with ethylene was used as an energy-independent substandard to extend the 2 MV calibration factor for a Baldwin-Farmer substandard dosemeter. The methods used to intercompare the chambers at the various qualities are described. Multiplying factors were derived to convert the reading of the Baldwin-Farmer dosemeter to rads in water.

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