|What is the Derived Concentration Guide
Order 5400.5, Radiation Protection of the Public and Environment,
establishes guidelines for concentrations of radionuclides in air
guidelines, referred to as derived concentration guide values, are
concentrations of radionuclides that, under conditions of continuous
exposure for one year by one exposure mode (e.g., inhalation,
ingestion) would result in a dose of 100 mrem to the public.
These derived concentration guide values are not limits, but
serve as reference values to assist in evaluating the radiological air
What is the maximum
contaminant level (MCL)?
The MCL is a
standard established by the United States Environmental Protection
Agency (EPA), under the Safe Drinking Water Act. It represents an
acceptable level of a chemical under specified conditions that ensures
the safety of a public drinking water supply.
What is a t-Test?
A t-Test is a statistical tool that is
used to determine whether the means of two samples are different or
not. One starts with the hypothesis that the two numbers
are the same. If the t-Test returns a p-value of more than .05,
then the hypothesis is accepted, and the sets of numbers can be
considered the same; otherwise, the sets of numbers are considered to