The file cfactors.txt defines time-varying emission values of radionuclides and it is used by programs tcmsum and condecay.
File Format
The emissions file format is simply the starting time of the emission given by year, month, day, and hour, and the emission rates in terms of units per hour. One or more radionuclides can be specified. The first record of all emissions file should contain the column labels then followed by the data records, one line for each release time period. For example, a constant emission rate corresponding to the 12 hour example test simulation (16 October 1996) would appear as follows:
YYYY MM DD HH TEST 1996 10 16 00 1.00E+12 1996 10 16 01 1.00E+12 1996 10 16 02 1.00E+12 1996 10 16 03 1.00E+12 1996 10 16 04 1.00E+12 1996 10 16 05 1.00E+12 1996 10 16 06 1.00E+12 1996 10 16 07 1.00E+12 1996 10 16 08 1.00E+12 1996 10 16 09 1.00E+12 1996 10 16 10 1.00E+12 1996 10 16 11 1.00E+12
Another example from the extended HYSPLIT tutorial on time varying emissions that employ four radionuclides is shown below:
YYYY MM DD HH I131g I131p C137p 2011 3 14 9 1.23E+13 1.23E+13 1.86E+12 2011 3 14 12 1.81E+14 1.81E+14 2.86E+13 2011 3 14 15 4.13E+14 4.13E+14 9.00E+13 2011 3 14 18 2.73E+14 2.73E+14 4.15E+13 2011 3 14 21 6.58E+14 6.58E+14 9.54E+13 2011 3 15 0 5.05E+14 5.05E+14 7.29E+13 2011 3 15 3 7.03E+13 7.03E+13 1.00E+13 2011 3 15 6 1.12E+14 1.12E+14 1.58E+13 2011 3 15 9 3.49E+15 2.67E+15 1.35E+14 2011 3 15 12 6.59E+15 2.82E+15 9.28E+13 2011 3 15 15 5.74E+14 2.46E+14 8.00E+12 2011 3 15 18 1.08E+14 4.61E+13 1.49E+12 2011 3 15 21 7.80E+13 7.80E+13 1.04E+13 2011 3 16 0 1.09E+15 1.09E+15 1.44E+14 2011 3 16 3 5.58E+14 5.58E+14 7.27E+13 2011 3 16 6 7.18E+14 7.18E+14 9.06E+13 2011 3 16 9 7.18E+14 7.18E+14 9.06E+13