Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation

Importancia y uso:

4.1 The absorbed dose is a more meaningful parameter than exposure for use in relating the effects of radiation on materials. It expresses the energy absorbed by the irradiated material per unit mass, whereas exposure is related to the amount of charge produced in air per unit mass. Absorbed dose, as referred to here, implies that the measurement is made under conditions of charged particle (electron) equilibrium (see Appendix X1). In practice, such conditions are not rigorously achievable but, under some circumstances, can be approximated closely.

4.2 Different materials, when exposed to the same radiation field, absorb different amounts of energy. Using the techniques of this standard, charged particle equilibrium must exist in order to relate the absorbed dose in one material to the absorbed dose in another. Also, if the radiation is attenuated by a significant thickness of an absorber, the energy spectrum of the radiation will be changed, and it will be necessary to correct for this.

Note 1: For comprehensive discussions of various dosimetry methods applicable to the radiation types and energies and absorbed dose rate ranges discussed in this method, see ICRU Reports 34 and 80.

Subcomité:

E10.07

Referida por:

E1894-24, E1401-21, E0668-20, F0980-16R24, E1956-21, E1161-21, E1026-23, E1631-20, D1879-06R23, E1538-17, E2450-23, E1205-17, E1819-15R21, F1892-12R18, E1854-19, E1249-15R21, F1467-18

Volúmen:

12.02

Número ICS:

17.240 (Radiation measurements)

Palabras clave:

calculation of absorbed dose; charged particle equilibrium; radiation dosimetry;