Convert Ci to GBq
Convert curies to gigabecquerels by entering a value below.
How to Convert Curies to Gigabecquerels
The curie and gigabecquerel are both units of radioactivity. By definition, 1 curie equals exactly 37 gigabecquerels. This means to convert curies to gigabecquerels, you multiply by 37.
Formula
Step-by-Step Example
Convert 5 Ci to gigabecquerels:
We need to convert curies to gigabecquerels
Since 1 Ci = 37 GBq, multiply by 37
5 × 37 = 185
5 Ci = 185 GBq
Curie to Gigabecquerel Conversion Table
Quick reference table for common curie to gigabecquerel conversions. Click any value for detailed calculation.
| Curies (Ci) | Gigabecquerels (GBq) |
|---|---|
| 1 Ci | 37 GBq |
| 2 Ci | 74 GBq |
| 5 Ci | 185 GBq |
| 10 Ci | 370 GBq |
| 15 Ci | 555 GBq |
| 20 Ci | 740 GBq |
| 25 Ci | 925 GBq |
| 50 Ci | 1850 GBq |
| 100 Ci | 3700 GBq |
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.
Gigabecquerel (GBq)
A gigabecquerel (GBq) equals 10⁹ becquerels or 27 millicuries. Used for cancer therapy doses (I-131: 3-7 GBq), industrial radiography sources (0.5-5 TBq), and brachytherapy seeds. Higher activity requires special handling.
Frequently Asked Questions
How do I convert curies to gigabecquerels?
To convert curies to gigabecquerels, multiply the value by 37. For example, 10 Ci = 370 GBq.
How many gigabecquerels are in 1 curie?
1 curie equals 37 gigabecquerels.
What is the formula for curies to gigabecquerels?
The formula is: GBq = Ci × 37.