How should I interpret these decay chain numbers? I've been parsing JSON radioactive decay data from the IAEA, and am trying to make sure I understand the numbers. 
Here is a simple example:
U-238
Decay α  100%
      SF 5.5E-5%
Major Radiations
Type keV     %
α    4198    79
     4151    21
γ      13.00  7.3
       49.55  0.064
OK. If I have this data, and I want to know how to guess what kind of radiation is going to be released over time from a given amount of U-238, what can I conclude? My understanding: nearly 100% of the time it is going to have alpha decay, and I can probably (for my purposes) just ignore the spontaneous fission. Great. 79% of the time, that alpha will be in the form of a 4.198 MeV particle, and 21% of the time it will be 4.151 MeV. 
OK, but what about the gammas? Will there be a 13 keV gamma only 7.3% of the time? Is that 7.3% of the time for every alpha decay or is it only related to one of the specific alphas? This is the sort of thing I'm confused about.
One more example that illustrates some of my confusion:
Co-60
Decay β- 100%
Major radiations:
Type  keV      %
β-   95.77    99.88
    625.87     0.12
γ  1332.492   99.9826
   1173.228   99.85
OK, so 100% of the time, this decays via beta-minus. 99.88% of the time, that beta particle is going to be 95.77 keV, 0.12% of the time it is going to be 625.87 keV. The next bit is less clear to me: does this mean that 99.9% of the time, it will have a 1.3 MeV gamma, and that 99.85% of the time it will have a 1.2 MeV gamma? That is, if I were calculating the gamma output, for each decay I'd need to check both of these gammas? 
I know there are lots of gammas I am not counting here, and I'm really fine with that (for my purposes, a rough count of the most prominent ones is fine), but I just want to check that I'm understanding this correctly. 
Thank you.
 A: I think that you are best off by using some of the other data provided at the website that you are using although as pointed out in one of the comments information about the daughter is an important part of the jigsaw.
This page will provide with some data:
Betas from 60Co (5.2714 y 5)
Eb endpoint (keV)   Ib (%)      Decay mode
318,13              99.925 20   b- 
665,26               0.022      b- 
1491,38              0.057 20   b- 

Gammas from 60Co (5.2714 y 5) 
Eg (keV)     Ig (%)    Decay mode
346.93 7     0.0076 5     b-  
826.06 3     0.0076 8     b-  
1173.237 4  99.9736 7     b-  
1332.501 5  99.9856 4     b-  
2158.57 10   0.00111 18   b-  
2505         2.0E-6 4     b-

The Q-value for the decay is given as 2823.95 keV.
From such data you can build up an energy level diagram and you from the data above you could complete the annotation for the left hand decays:

From the diagram you can see that the beta decays result in excited Nickel nuclei which then go to the ground state via the emission of gammas.
I would not worry about the gamma decays not being shown as 100%.
Overall the energy released whatever gamma decay modes actually occur is the same when the Nickel nucleus reaches its ground state.
There are a number of other energy level diagrams here.
