Below is a pasteurization table... It describes the temperature and time required to make meats safe to eat.....
Temperature Time Temperature Time
°F (°C) (Minutes) °F (°C) (Seconds)
130 (54.4) 112 min... 146 (63.3) 169 sec
131 (55.0) 89 min.... 147 (63.9) 134 sec
132 (55.6) 71 min.... 148 (64.4) 107 sec
133 (56.1) 56 min.... 149 (65.0) 85 sec
134 (56.7) 45 min.... 150 (65.6) 67 sec
135 (57.2) 36 min.... 151 (66.1) 54 sec
136 (57.8) 28 min.... 152 (66.7) 43 sec
137 (58.4) 23 min.... 153 (67.2) 34 sec
138 (58.9) 18 min.... 154 (67.8) 27 sec
139 (59.5) 15 min.... 155 (68.3) 22 sec
140 (60.0) 12 min.... 156 (68.9) 17 sec
141 (60.6) 9 min...... 157 (69.4) 14 sec
142 (61.1) 8 min...... 158 (70.0) 0 sec
143 (61.7) 6 min.......
144 (62.2) 5 min.......
145 (62.8) 4 min.......
Table C.1: Pasteurization times for beef, corned beef, lamb, pork and cured pork (FDA, 2009, 3-401.11.B.2).
Another source.... with explanations..
http://www.fao.org/docrep/010/ai407e/AI407E08.htm
FWIW, I usually double the time recommended at lower temperatures.... JUST IN CASE my therm is off or other sections of meat may have not reached the temperature all at the same time.....
example... 135 deg. for 36 minutes..... I extend to at least 72 minutes at that temp....