12 Va. Admin. Code § 5-481-3261
The licensee may use radioactive markers in wells only if the individual markers contain quantities of licensed material not exceeding the quantities specified in 12VAC5-481-3730. The use of markers is subject only to the requirements of 12VAC5-481-3220.
§ 32.1-229 of the Code of Virginia.
Derived from Virginia Register Volume 24, Issue 18, eff. June 12, 2008.