[Characteristics of thermoluminescent dosimeters for the brehmsstrahlung and electron radiation of the betatron B5M-25].
The authors present the results of the experimental and theoretical determination of coefficients of the transition from readings of thermoluminescent detectors on the basis of alumophosphate glass with manganese to an absorbed dose in the water, and the correlation between the detector readings and the depth in the phantom for betatron inhibitory and electron radiations. Comparative measurements of absorbed doses have been done with the help of a ferrosulphate system and 2 dosimeters with ionization chambers (VA-J-18 and Rado-con-III). It has been shown that in case of inhibitory radiation, the readings of thermoluminescent detectors show no correlation with changes of the spectral composition of radiation; for electrons with an average energy of the spectrum at 10 and 20 MEV this dependence does not exceed +/- 2% in the depths from 0 up to 90% of the practical running. Experimentally defined coefficients of the transition from detector readings to an absorbed dose in the water give an opportunity to measure absorbed doses with a summary error that does not exceed 10% (for the confidential interval 95%). The measurement data have been confirmed theoretically, and it makes it possible to use small-size autonomous glass detectors in clinical dosimetry including those for the direct measurement of irradiation doses patients receive, to control the results of the dosimetric planning of radiation therapy. Theoretical correlations obtained can be used for the prognosis of behaviour of thermoluminescent detectors in the fields of inhibitory radiation of high energies and arbitrary spectral composition as well as for electron spectra with energies up to 25 MEV.
D003037:Cobalt Radioisotopes / Q000627:therapeutic use; D004583:Electrons; D008961:Models, Structural; D010315:Particle Accelerators; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*
D003037:Cobalt Radioisotopes
Kharakteristiki termoliuminestsentnykh dozimetrov dlia tormoznogo i élektronnogo izlucheniĭ betatrona B5M-25.