word choice - Comparison between 'to emit" and 'to emanate'

I'd like to understand/ask how much these two words overlaps each other.

These definitions were excerpted from Oxford Dictionaries.
Do you think we can replace the word with emit in these sentences?
What I ask is that, for example, if we can say

" Wonderful smells were emitting from the kitchen."

or

"He emitting tranquility"

1.(Of a feeling, quality, or sensation) issue or spread out from (a source):

Warmth emanated from the fireplace

She felt an undeniable charm emanating from him

1.1Originate from; be produced by:

The proposals emanated from a committee

Angry ​voices ​emanated from the ​room. (Cambridge)

Wonderful smells were emanating from the kitchen. ( Logman)

1.2 [with object] Give out or emit (a feeling, quality, or sensation):

He emanated a powerful brooding air

He emanates tranquility. (Longman)

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And secondly, I cannot understand noun form of the word 'to emanate'

1. Does "the risk of radon gas emanation" have the same meaning with " the risk of radon gas emission"




2. What does "The unique symbol for the comprehensive oneness that holds together this entire process of emanation or divinization is the concept of Sophia" mean in this sense?

http://www.oxforddictionaries.com/definition/english/emanation