The efficacy of lead shielding in megavoltage radiotherapy
Creators
- 1. Christie Hospital and Holt Radium Inst., Manchester (United Kingdom)
Description
The dose received by anatomical structures which are apparently shielded by lead blocks during a course of megavoltage radiotherapy may not be negligible. The dose has three main components; there is that due to radiation transmitted through the shielding block, that due to radiation scattered within the patient and that due to radiation scattered prior to reaching the patient and so circumventing the shield. A calculation method which separates the three components has been investigated and the results have been compared with measurements in a wide range of test situations for both cobalt-60 and 6 MV photon beams. The method of calculation predicts the dose behind the shielding block with acceptable accuracy in all the conditions investigated. (author)
Additional details
Publishing Information
- Journal Title
- British Journal of Radiology
- Journal Volume
- 66
- Journal Issue
- 782
- Journal Page Range
- p. 140-144.
- ISSN
- 0007-1285
- CODEN
- BJRAAP
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- United Kingdom
- INIS RN
- 24049911
- Subject category
- S61: RADIATION PROTECTION AND DOSIMETRY;
- Descriptors DEI
- COBALT 60; EFFICIENCY; GAMMA RADIATION; LEAD; MEV RANGE 01-10; PHOTON BEAMS; RADIOTHERAPY; SCATTERING; SHIELDING MATERIALS; SPATIAL DOSE DISTRIBUTIONS; X RADIATION
- Descriptors DEC
- BEAMS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; COBALT ISOTOPES; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ELEMENTS; ENERGY RANGE; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; IONIZING RADIATIONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATERIALS; MEDICINE; METALS; MEV RANGE; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-ODD NUCLEI; RADIATION DOSE DISTRIBUTIONS; RADIATIONS; RADIOISOTOPES; SPATIAL DISTRIBUTION; THERAPY; YEARS LIVING RADIOISOTOPES