tokens: In implementing the different approaches in clause 6.2 the radiation shielding model shall include in the calculations the following geometry elements : 1 . Parts packaging , as specified in clause 6.3.2.1 . NOTE Since it is the one that is the closest to the sensitive portion of the part ( the die ) , the influence of packaging on the radiation received by the component can be important , especially for electrons or low - energy ( up to a few 10 ’s MeV ) protons . 2 . Equipment , as specified in clause 6.3.2.2 . 3 . Spacecraft , as specified in clause 6.3.2.3 . 4 . Interfaces between spacecraft and ( sub)system , as specified in clause 6.3.2.4 . NOTE Omission from the calculation of geometry elements normally leads to conservative calculations ( higher radiation effect predictions ) , although some packaging and other materials near the die can enhance radiation levels in the die .