Description
Measure contact duration between supplied exposure-diary endpoints.
Environmental-health records connect sampled matrices, background references, observed areas, service dates and contact durations. An areal loading differs from a bulk or airborne concentration, and a censored result label differs from a quantified value. These summaries do not establish safe conditions or individual health risk.
Measure contact duration between supplied exposure-diary endpoints.
When to use this tool
Use Exposure Diary Contact Duration when checking the stated environmental-health record, measurement basis or time convention.
How to use the tool and how it works
- Enter startMinutes, endMinutes, excludedMinutes. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read recordedContactMinutes. Use the output convention below.
Require end>=start and excludedMinutes within [0,end-start]. Return end-start-excluded as recordedContactMinutes.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| startMinutes | Start Minutes | Required. Finite number. |
| endMinutes | End Minutes | Required. Finite number. |
| excludedMinutes | Excluded Minutes | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| recordedContactMinutes | Recorded Contact Minutes | Required. Finite number. |
{
"input": {
"startMinutes": 60,
"endMinutes": 150,
"excludedMinutes": 15
},
"output": {
"recordedContactMinutes": 75
}
}Limitations and assumptions
- Contact time is supplied, not a measured pollutant dose, health-risk estimate or safe-exposure judgment.
- 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 verified sampling and analytical records with qualified environmental-health professionals for actual exposure, remediation, water-quality or care decisions.
References
Similar or alternative tools
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- Sentinel Site Reporting Exposure Hours
Calculate reporting exposure from supplied sentinel-site hours.