Radioactive element in preservative for good health (5)

I believe the answer is:

salut

'good health' is the definition.
(both are toasts made before drinking)

'radioactive element in preservative' is the wordplay.
'radioactive element' becomes 'u' (chemical symbol for uranium).
'in' means one lot of letters goes inside another.
'preservative' becomes 'salt' (I've seen this before).
'u' put into 'salt' is 'SALUT'.

'for' acts as a link.

(Another definition for salut that I've seen is " your health".)

I've seen this clue in The Guardian.

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