1IAEA. Technical Reports Series No. 277. Absorbed dose determination in photon and electron beam. An International Code of Practice, Second Edition. Vienna : IAEA, 1997 : 46-65.
3IAEA. Technical Reports Series No. 277. Absorbed dose Determination in Photon and Electron Beams , an International Code of Practice. 2nd ed. Vienna:IAEA, 1997.37- 38
4IAEA. Technical Reports Series No. 381. The Use of Plane Parallel Ionization Chambers in High Energy Electron and Photon Beams, an International Code of Practice for Dosimetry. Vienna: IAEA, 1997.68 - 70
7IAEA Absobed dose determination in photon and electron beams an international code of practice. Technical. reports. series. No. 277, sec.ed. International. Atomic. Energy. Agency, Vienna, 1997.
