Description
For positive shiftHours, taskHours within zero through shiftHours, and nonnegative concentration and background return taskContribution=concentration*taskHours/shiftHours, backgroundContribution=background*(shiftHours-taskHours)/shiftHours, and their sum as weightedMean.
Occupational exposure calculations combine measured quantities, duration, reference conditions, weighting, and sampling support. Linear concentrations, squared acceleration, and logarithmic sound levels require different arithmetic. A supplied reference or limit is not automatically the applicable standard, and a local calculation is separate from a full exposure and safety assessment.
For positive shiftHours, taskHours within zero through shiftHours, and nonnegative concentration and background return taskContribution=concentration*taskHours/shiftHours, backgroundContribution=background*(shiftHours-taskHours)/shiftHours, and their sum as weightedMean.
When to use this tool
Use Exposure Time Weighted One Task Term when you need this particular sampling, duration, reference-unit, physical-exposure, or reporting-base term.
How to use the tool and how it works
- Enter concentration, taskHours, shiftHours, background. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read taskContribution, backgroundContribution, weightedMean. Use the output convention below.
For positive shiftHours, taskHours within zero through shiftHours, and nonnegative concentration and background return taskContribution=concentration*taskHours/shiftHours, backgroundContribution=background*(shiftHours-taskHours)/shiftHours, and their sum as weightedMean.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| concentration | Concentration | Required. Finite number; minimum 0. |
| taskHours | Task Hours | Required. Finite number; minimum 0. |
| shiftHours | Shift Hours | Required. Finite number; strictly above 0. |
| background | Background | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| taskContribution | Task Contribution | Required. Finite number. |
| backgroundContribution | Background Contribution | Required. Finite number. |
| weightedMean | Weighted Mean | Required. Finite number. |
{
"input": {
"concentration": 10,
"taskHours": 2,
"shiftHours": 8,
"background": 2
},
"output": {
"taskContribution": 2.5,
"backgroundContribution": 1.5,
"weightedMean": 4
}
}Limitations and assumptions
- Both concentrations need one unit and the remaining shift is modeled at a constant supplied background. No overlap, variable concentration, sampling adequacy, occupational limit, or safe exposure is determined.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete hazard-specific assessment with calibrated measurements and the appropriate exposure model. Verify reference conditions, sampling coverage, weighting, denominator, and the applicable professional or regulatory method.
References
Similar or alternative tools
- Exposure Task Double Count Minute
Remove supplied duplicate task minutes without assessing exposure safety.
- Task Exposure Duration Weight
Return one supplied research duration-weighted exposure term; no occupational limit or compliance determination.