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To: Bill Jackson who wrote (21699)12/6/2000 4:14:10 PM
From: pgerassiRead Replies (2) | Respond to of 275872
 
Dear Bill:

The cheapest way to make something isotopically pure is to add a halogen to the silicon converting it to a gas and then use a gas centrifuge to separate the isotopes. They are long lived, easy to run, do not use much power, and would be cheap compared to other methods. Then you simply strip off the halogen away chemically and you have you pure Si-28.

Gas diffusion is an old technology used in Nuclear weapons plants to make pure U-235. Now they use gas centrifuges instead getting higher purity, higher production, and lower footprint at a much cheaper cost.

Pete



To: Bill Jackson who wrote (21699)12/6/2000 10:22:21 PM
From: fyodor_Read Replies (1) | Respond to of 275872
 
Bill: Someone quoted a cost of about $10 per die....was that solid or epitaxially over plated?

Isonics quotes $10 for the bulk Si-28 wafers and a tenth of that for the epi.

A separate page on their site (under products) lists $5-$25 for bulk and $.10-$1 for the epi.

-fyo


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