What is being measured?
Absorbed dose is deposited energy per mass. It is not the same quantity as equivalent dose or a clinical interpretation.
rad means radiation absorbed dose here, not radians. Absorbed dose does not directly convert to equivalent dose without radiation weighting.
Meaning of nGy
Nanograys uses the symbol nGy in this library and measures absorbed radiation dose. Under the stated reference convention, 1 nGy = approximately 1e-9 Gy. 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 (1e-9), then divide by the target factor (1). The factor ratio expresses the same absorbed radiation dose measurement in the other unit.
Worked example
For a known value of 10 nGy, the reference conversion gives 1e-8 Gy. Converting that result back gives approximately 10 nGy. 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 (nGy) | Reference equivalent (Gy) |
|---|---|
| 1 | 1e-9 |
| 5 | 5e-9 |
| 10 | 1e-8 |
| 25 | 2.5e-8 |
| 50 | 5e-8 |
| 100 | 1e-7 |
Compare one nGy with other units
| Target unit | Equivalent of 1 nGy | Definition guide |
|---|---|---|
| Grays (Gy) | 1e-9 | Read definition |
| Milligrays (mGy) | 0.000001 | Read definition |
| Micrograys (µGy) | 0.001 | Read definition |
| Rads (absorbed dose) (rad) | 1e-7 | Read definition |
| Kilograys (kGy) | 1e-12 | 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 converter
- Nanograys to Grays converter
- Nanograys to Milligrays converter
- Nanograys to Micrograys converter
- Nanograys to Rads (absorbed dose) converter
- Nanograys to Kilograys 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.