Search results

Results 1 - 10 of 579 for half-life within all areas of the EPA. Only web pages are included. Search all document formats.

Show 102550100 per page  

Understanding Radiation: Half - Life09-27-2007

"Provides information about half - life."

http://www.epa.gov/radiation/understand/halflife.html (HTML)

Ag 101: Half - Life08-23-2007

"Ag 101 provides information on how a half-life relates to agricultural pesticide use."

http://www.epa.gov/agriculture/ag101/pesthalflife.html (HTML)

EPA On-line Tools for Site Assessment Calculations--Half Life Conversions

... 1/2 = 0.6931/λ, where t 1/2 is the half life and λ is the first order rate constant.

http://www.epa.gov/athens/learn2model/part-two/onsite/halflife.htm (HTML)

Modeling Subsurface Transport of Petroleum Hydrocarbons--Old Half Life Calculator

Please update your book mark to the Half Life/Rate Constant Conversion calculator... Ecosystems Research Division Modeling Subsurface Transport of Petroleum Hydrocarbons--Old Half Life Calculator Half Life/Rate Constant.

http://www.epa.gov/athens/learn2model/reference/halflife.htm (HTML)

Guidance for Selecting Input Parameters in Modeling the Environmental Fate and Transport of Pesticides | Pesticides | US EPA11-25-2009

If multiple aerobic soil metabolism half-life values are available, enter the 90 th percentile confidence bound on the mean half-life value (see Equation 1 in Appendix A for instructions ...

http://www.epa.gov/oppefed1/models/water/input_parameter_guidance.htm (HTML)

Water Models; Guidance for Selecting Input Parameters | Pesticides | US EPA06-17-2009

GENEEC2 prompts for the hydrolysis half-life only if a zero (0) is entered for the aerobic aquatic half-life (see above explanation for aerobic aquatic metabolism half-life ...

http://www.epa.gov/oppefed1/models/water/input_guidance2_28_02.htm (HTML)

Interim Guidance for Using Ready and Inherent Biodegradability Tests to Derive Input Data for Multimedia Models and Wastewater Treatment Plants (WWT) Models (9/1/2000) | OPPT | OPPTS | US EPA09-06-2007

They then calculated mean ratios of half-life in water to half-life in aerobic surface soil for 20 chemicals ...

http://www.epa.gov/oppt/exposure/pubs/halflife.htm (HTML)

Section 4.1.2.2.1.2, page 51612 | Superfund | US EPA06-03-2009

In assigning this value, evaluate persistence based primarily on the half-life of the hazardous substance in surface water and secondarily on ...

http://www.epa.gov/superfund/training/hrstrain/htmain/s412212.htm (HTML)

EPA On-line Tools for Site Assessment Calculation01-12-2010

... 1/2 = 0.6931/λ, where t 1/2 is the half life and λ is the first order rate constant.

http://www.epa.gov/athens/learn2model/part-two/onsite/halflife.html (HTML)

Radioactive Equilibrium09-27-2007

When the half-life of the original radionuclide is only slightly longer or about the same as the half life of the decay product, the total activity rises initially ...

http://www.epa.gov/radiation/understand/equilibrium.html (HTML)

[Prev] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [Next]