7.5.2 Calculation of the ionizing dose

a. The calculation of the ionising dose in the target shall use the particle fluxes at the surface of the TID-sensitive elements of the component or material.

NOTE Methods for the related shielding calculation are specified in clause 6.2.

b. At a point or in a finite volume, the dose shall be calculated as follows:

1. Calculate particle ionization energy as follows:

(a) Calculate charged particle ionisation restricted stopping power (or LET) in the material, or in the case of photons, mass energy absorption coefficients, or

(b) Calculate particle ionisation energy deposition in a volume where the radiation field suffers negligible change (either by attenuation or multiple scattering, traversing the volume) or extended volumes.

NOTE Monte-Carlo methods can be used for this purpose.

2. Use tabulations of dose versus flux and shielding information.

NOTE This is the case of SHIELDOSE and SHIELDOSE-2-2/span>

c. Analyse dose enhancement effects due to changes in material composition in the vicinity of, or within a target, as a result of using high-Z materials.

NOTE For more details on dose enhancement phenomena, see ECSS-E-HB-10-12, section 5.f.