Need help on constants for Matlab nuke sim for uni project

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MrAAK
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Hey guys, I am currently working on a uni MATLAB group project for blast radius, thermal radius etc.
Apparently these formula are the best possible to use:

r_thermal = Y^0.41 * constant_th
r_blast = Y^0.33 * constant_bl
r_radiation = Y^0.19 * constant_rad

But can anybody tell me what constant_th, constant_bl & constant_rad are?
I've had no joy in 2 days of searching.
Any help would be appreciated!

The result I am expecting is to come out in metres (for radius).

The equations were found here, apparently they are the gold standard for modelling nuclear detonation effects.

http://nuclearweaponarchive.org/Nwfaq/Nfaq5.html
 
No worries, I called the US defence department, surprisingly helpful to an Irishman (real one, not American).
Cheers.