a. A first-order estimate of the influence of shielding shall be made by determining the dose or particle fluence corresponding to the most lightly shielded part of the subsystem under evaluation using the simplified approaches specified in clause 6.2.2.
NOTE 1 Example of secondary radiation is bremsstrahlung.
NOTE 2 In some special circumstances (e.g. for galactic cosmic rays in high-Z materials) enhancement in radiation levels from secondary particles as a result of additional shielding can take place.
c. In cases other than requirement 6.2.1.1b, one of the following analyses of the shielding shall be performed:
¾ a sector-analysis, as specified in clauses 6.2.2 and 6.2.3, or
¾ a detailed radiation transport simulation of the whole or a part of the spacecraft, as specified in clause 6.2.4.
¾ shielding analysis as part of a simultaneous complete analysis with all sensitive locations defined, irrespective of whether problems are apparent or not.
a. The shielding analysis specified in clause 6.2.1.1 shall include
1. the secondary radiation effects in accordance with the mission types identified in Table 6‑1.
2. for specialised instrumentation agreed with the customer (such as astrophysics radiation detectors), all prompt and delayed radioactive emissions which have the potential to produce background signals.
NOTE This can be done either by including them in the calculations, or by demonstrating that the effect is negligible.