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Table 1 Nine groups of tested samples and their corresponding nominal radiation fluences, equivalent to in-orbit exposures over 0.6, 6, 12 and 24 months with protons at 100 MeV. Each APD in group 5 was biased during irradiation at 20 V above its breakdown voltage. Group 9 was not irradiated, and kept as a control

From: Mitigating radiation damage of single photon detectors for space applications

Group

Device type and quantity

Fluence @ 100 MeV, protons/cm 2

1

SLiK - 2 pcs

108

SAP500S2 - 2 pcs

2

SLiK - 2 pcs

109

SAP500S2 - 2 pcs

3

SLiK - 2 pcs

2 × 109

SAP500S2 - 2 pcs

C30921SH - 2 pcs

4

SLiK - 2 pcs

4 × 109

SAP500S2 - 2 pcs

C30921SH - 2 pcs

5

SLiK - 2 pcs

4 × 109 (biased)

SAP500S2 - 2 pcs

C30921SH - 2 pcs

6

H7422-40 - 1 pc

109

7

H7422-40 - 1 pc

2 × 109

8

H7422-40 - 1 pc

4 × 109

9

SLiK - 2 pcs

0

SAP500S2 - 2 pcs

C30921SH - 2 pcs

H7422-40 - 1 pc