Convert Curie to Millicurie
Input the number of curies you want to convert to millicuries.
How to Convert Curies to Millicuries
The curie and millicurie are both units of radioactivity. By definition, 1 millicurie equals exactly 1000000 curies. This means to convert curies to millicuries, you divide by 1000000.
Formula
Step-by-Step Example
Convert 5 Ci to millicuries:
We need to convert curies to millicuries
Since 1 mCi = 1000000 Ci, divide by 1000000
5 ÷ 1000000 = 5e-6
5 Ci = 5e-6 mCi
Curie to Millicurie Conversion Table
Quick reference table for common curie to millicurie conversions. Click any value for detailed calculation.
| Curies (Ci) | Millicuries (mCi) |
|---|---|
| 0.1 Ci | 1e-7 mCi |
| 0.5 Ci | 5e-7 mCi |
| 1 Ci | 1e-6 mCi |
| 2 Ci | 2e-6 mCi |
| 5 Ci | 5e-6 mCi |
| 10 Ci | 1e-5 mCi |
| 25 Ci | 2.5e-5 mCi |
| 50 Ci | 5e-5 mCi |
| 100 Ci | 0.0001 mCi |
About These Units
Curie (Ci)
The curie (Ci) is the traditional unit of radioactivity, originally defined as the activity of 1 gram of Ra-226. One curie = 3.7×10¹⁰ decays/second = 37 GBq exactly. Named after Marie and Pierre Curie. Still used in US nuclear medicine and industry.
Millicurie (mCi)
A millicurie (mCi) equals 0.001 curie or 37 MBq. Standard unit for nuclear medicine imaging in US: thyroid uptake 0.1-0.2 mCi, bone scan 20-30 mCi, cardiac stress test 25-35 mCi. Laboratory calibration sources: 1-10 mCi typical.
Frequently Asked Questions
How do I convert curies to millicuries?
To convert curies to millicuries, divide the value by 1000000. For example, 10 Ci = 1e-5 mCi.
How many millicuries are in 1 curie?
1 curie equals 1e-6 millicuries.
What is the formula for curies to millicuries?
The formula is: mCi = Ci ÷ 1000000.