I am afraid that people who usualy answer here do not understand your question, especially the description of the tank and the source.
Also the relation between the dose rate map in PHITS and the FLUKA contour plot is not clear to me.
For the question on normalisation, FLUKA gives the dose rate in pSv/primary. You would have to know how many primaries per year are hitting the target (or emitted by a radioactive source) to calculate the annual dose.
And finally, the correct name for H*(10) is “ambient dose equivalent”.
Best regards, Thomas @totto