الفهرس 
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Abstract
One of the recent dosimetry protocols for te dosimetry of high-energy photon and electron beams using the plar.e parallel ionization chamber was introduced by the IAEA on
1997 (TRS 381). This protocol is an extension and
complementary of the previous IAEA protocol (TRS 277).
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Before the publication of this protocol, TRS381, the most
famous dosimetry protocols used in Egypt were the IAEA
(TRS 277): the American Association of Physicists in
Medicine AAPM {TG21 (1983), TG25 (1991) and tG39 (1994)}(called TG-protocol in this work) and Nederlandse Commissie Voor Stralingsdosimetrie (NCS) (1986,1989) dosimetry protocols.
An intercomparative study is performed to know the
improvement level carried by the new international dosimetry protocols to the ratiotheraputec dosimetry in both photon and electron beams in Egypt.
The study is authored in five chapters contained in this thesis. The first chapter is a literature review on dosimetry protocol. The second chapter illustrates the dosimetric units, quantities and terminology. The third chapter focused on the formalism and the recommended data in the protocols of interest. The fourth chapter includes description of the therapeutic units, specification of phantoms and dosimetry systems used in this work and detailed information about the various steps of the experimental work. The fifth chapter includes results, discussion and conclusion in two parts: part (I) for photons and part (II) for electrons.