Do not substitute the Velostat shielding with other materials. The Velostat made by 3M works!DNA
I was in microbiology lab talking to a genetics researcher the other day when he pointed to a big freezer on one side of the tiny room. "We've got 50,000 human genes in there," he explained.
I can't explain exactly why, but I thought a freezer full of human genes was pretty darn cool.