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Total perturbation correction factor for PTW and NACP plane parallel chambers in electron beams. 1991

C Cinos, and M C Lizuain, and M I Febrian
Servicio de Física y Pratección Radiológica, Hospital de Bellvitge Principes de España, L'Hospitalet de Ll., Barcelona, Spain.

The international protocols of electron dosimetry published by the Nordic Association of Clinical Physics and the Sociedad Española de Física Médica recommend the use of a total perturbation correction factor pu, pp which is constant for all plane parallel chambers. In this work we have compared the dose measured with the PTW-Markus and NACP plane parallel chambers in respect to a cylindrical one. The obtained results indicate that for the ionization chamber NACP the value of pu, pp = 1.000 +/- 0.005 is adequate while for the ionization chamber PTW the observed difference is explained by considering an individual total perturbation correction factor variable with the mean energy at depth z, Ez, as the fluence perturbation correction factor pf is usually given for cylindrical chambers.

UI MeSH Term Description Entries
D008433 Mathematics The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Mathematic
D011839 Radiation, Ionizing ELECTROMAGNETIC RADIATION or particle radiation (high energy ELEMENTARY PARTICLES) capable of directly or indirectly producing IONS in its passage through matter. The wavelengths of ionizing electromagnetic radiation are equal to or smaller than those of short (far) ultraviolet radiation and include gamma and X-rays. Ionizing Radiation,Ionizing Radiations,Radiations, Ionizing
D011878 Radiotherapy The use of IONIZING RADIATION to treat malignant NEOPLASMS and some benign conditions. Radiotherapy, Targeted,Targeted Radiotherapy,Radiation Therapy,Radiation Therapy, Targeted,Radiation Treatment,Targeted Radiation Therapy,Radiation Therapies,Radiation Therapies, Targeted,Radiation Treatments,Radiotherapies,Radiotherapies, Targeted,Targeted Radiation Therapies,Targeted Radiotherapies,Therapies, Radiation,Therapies, Targeted Radiation,Therapy, Radiation,Therapy, Targeted Radiation,Treatment, Radiation
D011879 Radiotherapy Dosage The total amount of radiation absorbed by tissues as a result of radiotherapy. Dosage, Radiotherapy,Dosages, Radiotherapy,Radiotherapy Dosages
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013679 Technology, Radiologic The application of scientific knowledge or technology to the field of radiology. The applications center mostly around x-ray or radioisotopes for diagnostic and therapeutic purposes but the technological applications of any radiation or radiologic procedure is within the scope of radiologic technology. Radiologic Technology,Technology, Radiological,Radiological Technology

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