real-time soft error rate (RTSER); system soft error rate (SSER)

The soft error rate in a naturally occurring alpha particle and neutron environment.

NOTE 1 The RTSER is measured using a large number of devices to obtain a statistically significant error count, in contrast to an accelerated SER test, where an intense radiation source is used on a single device or a small number of devices.

NOTE 2 The RTSER error rate can be increased by using a higher neutron flux at higher altitudes, but for the purposes of this specification, the term "accelerated" is reserved for intense radiation sources that do not occur in natural terrestrial environments.

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