10.3 Instrument technologies susceptible to radiation-induced backgrounds

a. If one of the technologies or instruments identified in Table 10‑1 is used in spacecraft or planetary-mission systems, the potential radiation-induced background effects shall analysed.

b. The mechanisms shall be analysed by which the energetic radiation environment can deposit energy in the instrument so as to register as a sensor event.

NOTE The reason is that spacecraft scientific payloads are often unique.

c. The analysis specified in requirement 10.3b shall include:

1. Events from prompt ionisation by primary particles and all prompt secondaries

NOTE For example, X-ray fluorescence.

2. The potential “pile-up” of such ionising events, within the temporal-resolution of the sensor, which results in higher-than-expected energy deposition.

3. Delayed ionisation effects from induced radioactivity.

NOTE As specified in Clauses 7, 8 and 9, calculation of susceptibility to other radiation effects (total ionising dose, displacement damage, and single event effects) is also normative.