INTERNATIONAL recommendations on radiological units (London, 1950).

Abstract

International Recommendations on Radiological Units (London, 1950)Published Online:28 Jan 2014https://doi.org/10.1259/0007-1285-24-277-54SectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail AboutAbstract1. For the correlation of the dose of any ionizing radiation with its biological or related effects the International Commission on Radiological Units (I.C.R.U.) recommends that the dose be expressed in terms of the quantity of energy absorbed per unit mass (ergs per gramme) of irradiated material at the place of interest.In the foregoing paragraph by “energy absorbed” is meant the energy imparted to the material by ionizing particles at the place of interest.2. Inasmuch as calorimetric methods are not usually practicable, ionization methods are generally employed. For this purpose the quantity which must be measured is the ionization produced in a gas by the same flow of corpuscular radiation as exists in the material under consideration. The energy, Em, imparted to unit mass of the material, is then essentially related to the ionization per unit mass of gas, Jm, by the equation: where W is the average energy expended by the ionizing particles per ion pair formed in the gas, and s is the ratio of the mass stopping power of the material to that of the gas.3. Since the calculation of the dose in absolute energy units from measurements of ionization requires a knowledge of the parameters W and s as well as variables characterising the radiation and the irradiated material, the I.C.R.U. is of the opinion that tables of the best available data should be prepared as soon as possible and held under continual revision. Previous article FiguresReferencesRelatedDetailsCited byGeneral considerations regarding the dosimetry of roentgen and gamma radiationApplied Scientific Research, Vol. 3, No. 1General considerations regarding the dosimetry of roentgen and gamma radiationApplied Scientific Research, Section B, Vol. 3, No. 1 Volume 24, Issue 277January 1951Pages: 1-56 © The British Institute of Radiology History Published onlineJanuary 28,2014 Metrics Download PDF