EPA has assessed dietary risk by estimating exposure to endosulfan residues from consumption of food and drinking water that can occur over a single-day (acute) or longer (chronic).

Under the program, America Online will guarantee audiences and set ad rates based on the cost-per-thousand model used for media like magazines, measuring actual page views rather than estimating exposure.

ZIP codes and census tracts are a coarse spatial unit for aggregating cancer cases and for estimating individual exposure to air toxics.

In the long term, other spatial divisions may be more appropriate for estimating environmental exposure - watersheds, aquifers, or local public water systems for water-borne substances, or "windsheds" for airborne substances.

It used the best available methods to estimate past exposure to magnetic fields in the home.

It also enables scientists to estimate exposure to environmental contamination.

This makes it difficult to estimate exposure of populations.

(1) Measurement of benzene in an individual's breath or blood or the measurement of breakdown products in the urine (phenol) can estimate personal exposure.

While the cancer institute had estimated the radiation dose for every county in the nation, the report today said data were too scanty for such estimates and "probably too uncertain to be used in estimating individual exposure."

At Becker, he developed the "plot" system, a computer model for estimating exposure to risk in stock option trades.