Radioactivity
nCitomCi
Convert nanocuries (nCi) to millicuries (mCi).
Factor1 nCi = 1e-6 mCi
Converter
nCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = nCi × 1e-6
Multiply any value in nanocuries by 1e-6 to obtain the value in millicuries.
Worked example
Convert 1.00000e+6 nCi to mCi.
- 01Start with 1.00000e+6 nCi.
- 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 mCi.
Result1.00000e+6 nCi = 1 mCi
Conversion table
| nCi | mCi |
|---|---|
| 1 | 1e-6 |
| 2 | 2e-6 |
| 5 | 5e-6 |
| 10 | 1e-5 |
| 20 | 2e-5 |
| 50 | 5e-5 |
| 100 | 0.0001 |
| 200 | 0.0002 |
| 500 | 0.0005 |
| 1000 | 0.001 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from nCi to mCi?
1 nCi equals 1e-6 mCi. To convert, multiply the value in nanocuries by 1e-6.
How do I convert 1 nCi to mCi?
1 nCi = 1e-6 mCi. For any value, multiply by 1e-6.
How do I convert mCi back to nCi?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 mCi = 1.00000e+6 nCi.
When would I need to convert nanocurie to millicurie?
Radioactivity (activity) conversions between nCi and mCi are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).