What is being measured?
Absorbed-dose rate is absorbed dose per time. Integrating a changing rate requires a time history, not only a unit conversion.
A constant dose rate times duration gives dose. No conversion to equivalent dose rate without weighting.
Meaning of mGy/h
Milligrays per hour uses the symbol mGy/h in this library and measures absorbed radiation dose rate. Under the stated reference convention, 1 mGy/h = approximately 2.77777777778e-7 Gy/s. This equivalence changes how a known value is written. It does not increase measurement accuracy or establish whether a measurement is appropriate to a real application.
Conversion method
Multiply the value by the source factor (0.00000027777777777777777777777777777777777777777777777778), then divide by the target factor (1). The factor ratio expresses the same absorbed radiation dose rate measurement in the other unit.
Worked example
For a known value of 10 mGy/h, the reference conversion gives 0.00000277777777778 Gy/s. Converting that result back gives approximately 10 mGy/h. This reverse check helps catch a reversed factor, but matching round-trip arithmetic alone does not independently verify a source definition.
Common reference values
| Input (mGy/h) | Reference equivalent (Gy/s) |
|---|---|
| 1 | 2.77777777778e-7 |
| 5 | 0.00000138888888889 |
| 10 | 0.00000277777777778 |
| 25 | 0.00000694444444444 |
| 50 | 0.0000138888888889 |
| 100 | 0.0000277777777778 |
Compare one mGy/h with other units
| Target unit | Equivalent of 1 mGy/h | Definition guide |
|---|---|---|
| Grays per second (Gy/s) | 2.77777777778e-7 | Read definition |
| Grays per hour (Gy/h) | 0.001 | Read definition |
| Micrograys per hour (µGy/h) | 1000 | Read definition |
| Rads per hour (rad/h) | 0.1 | Read definition |
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Unit reference only. These pages do not assess biological effects, clinical use, exposure limits or radiation safety. Absorbed dose, equivalent dose, activity and exposure remain different quantities; unit scaling cannot convert one into another.
Use a working converter
- Absorbed radiation dose rate converter
- Milligrays per hour to Grays per hour converter
- Milligrays per hour to Grays per second converter
- Milligrays per hour to Micrograys per hour converter
- Milligrays per hour to Rads per hour converter
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.