Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Crawford Martin, regarding a legal question submitted for clarification; Authority of the Legislature to appropriate funds from the Texas Parks Fund No. 31 for the purpose of planning for statewide development of all park lands within the State.

The method of defining detection limits which has been adopted by the 222-S Analytical Laboratory counting room is described. The system for reporting limits defines two levels of detection limits: the critical level (L/sub c/) which must be exceeded before a sample can be said to contain any material above the background level and a detection limit (L/sub D/) at which we can be 95% sure that we will detect material. The common method of using twice the standard deviation of the background as a lower detection limit was found to lead to erroneous results. Equations relating L/sub c/ and L/sub D/ to the magnitude and standard deviation of the background were derived. Two examples illustrate the use of these levels. (auth)

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