Gauges containing sealed radioactive source

spent source rock

radioactive source

standard radioactive source

the operative length of the radioactive source

Sealed source

a spent bullet

annular spent fuel decay storage

barley spent grains

brewer s spent grains

brewer’s spent grain

brewer’s spent grains

brewer′s spent grains

carbonation decomposed spent liquid

chrome electroplating spent liquor

Chromium Plating Spent Solution

copper spent electrolyte

corn spent grain

Daqu spent grains