RADIATION CHARACTERISTICS OF A KILOCURIE REVOLVING COBALT 60 THERAPY UNIT
This machine has demonstrated that the advantage of small scattering of high energy radiation need not be sacrificed to the large penumbra resulting from the use of extended sources. It has been demonstrated that specific activities in the ramge of hundreds of curies per gram can be prcduced. It is easy, with a modest expenditure in self-absorption, to achieve sources of less than 1 cm diameter, but sources of 0.5 cm diameter seem outside the range of practical achievement. It is evident from the single beam isodose distributions that a small penumbra was indeed achieved. Significant differences in distribution are obtained by changing from complete rotation to sector rotation. Depth dose distributions for moving beams of small cross-section show a very rapid fall-off of dose outside the tumor region. As the cross-section of the beam approaches that of the phamtom, this fall-off becomes less steep. (auth)
- Research Organization:
- Argonne Cancer Research Hospital, Chicago
- NSA Number:
- NSA-13-000019
- OSTI ID:
- 4301622
- Journal Information:
- Am. J. Roentgenol. Radium Therapy Nuclear Med., Journal Name: Am. J. Roentgenol. Radium Therapy Nuclear Med. Vol. Vol: 80
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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