Convert Curies to Rutherfords (Ci to Rd)
1 curie (Ci) = 37000 rutherfords (Rd). 1 Rd = 0.00002702702703 Ci. Example: 15 Ci = 15 × 37000 = 555000 Rd.
Also searched as curies to Rd, curies in Rd, curies into rutherfords, Ci to Rd, Ci in rutherfords, Ci into rutherford, curie to rutherford, Ci to rutherfords converter and how many rutherfords in a curie.
1 Ci = 37000 Rd
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk curie to rutherford converter to paste a column from Excel.
How to Convert Curie to Rutherford
- 1 Ci = 37000 Rd
- 1 Rd = 0.00002702702703 Ci
- Example: convert 15 Ci to Rd: 15 Ci = 15 × 37000 Rd = 555000 Rd
Formula
Rd = Ci × 37000
Derivation from SI units:
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 Rd = 10⁶ Bq (obsolete).
- 1 Ci = 37000000000 Bq ÷ 1000000 Bq per Rd = 37000 Rd
Both units are defined exactly, so the factor is exact. Curie definition: curie; Rutherford definition: rutherford.
Worked examples
- A reading of 2 Ci converts to 74000 Rd.
2 Ci × 37000 = 74000 Rd - A value of 20 Ci is 740000 Rd.
20 Ci × 37000 = 740000 Rd
Curie to Rutherford conversion table
| Curies (Ci) | Rutherfords (Rd) |
|---|---|
| 0.1 Ci | 3700 Rd |
| 0.5 Ci | 18500 Rd |
| 1 Ci | 37000 Rd |
| 2 Ci | 74000 Rd |
| 5 Ci | 185000 Rd |
| 10 Ci | 370000 Rd |
| 20 Ci | 740000 Rd |
| 50 Ci | 1850000 Rd |
| 100 Ci | 3700000 Rd |
| 1000 Ci | 37000000 Rd |
Where it's used
Curies are used for US nuclear regulation and licences, while rutherfords appear in older nuclear physics literature. Both measure activity of a radioactive source, so the conversion is a fixed factor.
Curie to other radioactivity units
| Conversion | 1 Ci equals |
|---|---|
| curie to rutherford | 37000 Rd |
| curie to becquerel | 37000000000 Bq |
| curie to megabecquerel | 37000 MBq |
| curie to millicurie | 1000 mCi |
| curie to picocurie | 1000000000000 pCi |
| curie to kilobecquerel | 37000000 kBq |
| curie to gigabecquerel | 37 GBq |
| curie to microcurie | 1000000 µCi |
Show 3 more units
| curie to disintegration per minute | 2220000000000 dpm |
|---|---|
| curie to terabecquerel | 0.037 TBq |
| curie to nanocurie | 1000000000 nCi |
Frequently asked questions
How many rutherfords are in 1 curie?
1 Ci = 37000 Rd.
How do I convert curies to rutherfords?
Multiply the value in Ci by 37000. For example, 15 Ci × 37000 = 555000 Rd.
Is the Ci to Rd conversion exact?
Yes. Both units are defined exactly, and 1 Ci is exactly 37000 Rd.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "curie".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Curies to Rutherfords (Ci to Rd). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/curies-to-rutherfords/
IEEE
Scientific Converters, "Convert Curies to Rutherfords (Ci to Rd)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/curies-to-rutherfords/