Production of Francium Astatide?

Hello,

Francium (an alkali metal) and Astatine (a halogen) are the two most unstable naturally occuring metals. Francium's most stable isotope has a half-life of 22 minutes and Astatine's most stable isotope a half life of 8.1 hours. Reading about the two elements, it says "the extreme heat of decay caused by its short half-life would immediately vaporize any viewable quantity of the element" hence a visible quantity has never been assembled of either element. It also states "It remains to be seen if, with sufficient cooling, a macroscopic quantity of astatine could be deposited as a thin film". But hydroastatic acid and certain astatide salts have been produced. Based on the periodic trend, hydroastatic acid would be a strong acid and francium hydroxide a strong base so francium astatide would be a neutral salt. Inaddition, astatine has been used to label antibodies, biphosphonates, etc which is used to treat cancer. 

Questions

1. With local cooling, say using liquid nitrogen, would it be possible to create a visible quantity of this salt (FrAt)?

2. Does the heat of decay not denature the proteins and other molecules astatine is attached to?

Update:

If you can use it to label biomolecules you should be able to also produce salts like FrAt, right?

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