Step 4. When the time interval matches up, read the hour under the 50 cGyph. The 50 cGyph
dose rate was read at 1600; this corresponds to H + 12. This means H-hour was 12 hours earlier than
1600. H-hour is 1600 1200 = 0400.
Locate the first reading.
Locate the second reading.
Step 1
Step 2
Rotate the intermediate disk to set 2 ,, hours
Take B + 12 reading beneath 50 cGyph
between the readings.
Intermediate
disk
Step 4
Step 3
Figure 4-1. Determining H-Hour Using the ABC-M1A1 RADIAC Calculator
CM2306
4-5
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