Convert Rutherfords to Curies (Rd to Ci)
1 rutherford (Rd) = 0.00002702702703 curies (Ci). 1 Ci = 37000 Rd. Example: 15 Rd = 15 × 0.00002702702703 = 0.0004054054054 Ci.
Also searched as rutherfords to Ci, rutherfords in Ci, rutherfords into curies, Rd to Ci, Rd in curies, Rd into curie, rutherford to curie, Rd to curies converter and how many curies in a rutherford.
1 Rd = 0.00002702702703 Ci
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk rutherford to curie converter to paste a column from Excel.
How to Convert Rutherford to Curie
- 1 Rd = 0.00002702702703 Ci
- 1 Ci = 37000 Rd
- Example: convert 15 Rd to Ci: 15 Rd = 15 × 0.00002702702703 Ci = 0.0004054054054 Ci
Formula
Ci = Rd ÷ 37000
Derivation from SI units:
- 1 Rd = 10⁶ Bq (obsolete).
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 Rd = 1000000 Bq ÷ 37000000000 Bq per Ci = 0.00002702702702703 Ci
Both units are defined exactly, so the factor is exact. Rutherford definition: rutherford; Curie definition: curie.
Worked examples
- A reading of 2 Rd converts to 0.00005405405405 Ci.
2 Rd × 0.00002702702703 = 0.00005405405405 Ci - A value of 20 Rd is 0.0005405405405 Ci.
20 Rd × 0.00002702702703 = 0.0005405405405 Ci
Rutherford to Curie conversion table
| Rutherfords (Rd) | Curies (Ci) |
|---|---|
| 0.1 Rd | 0.000002702702703 Ci |
| 0.5 Rd | 0.00001351351351 Ci |
| 1 Rd | 0.00002702702703 Ci |
| 2 Rd | 0.00005405405405 Ci |
| 5 Rd | 0.0001351351351 Ci |
| 10 Rd | 0.0002702702703 Ci |
| 20 Rd | 0.0005405405405 Ci |
| 50 Rd | 0.001351351351 Ci |
| 100 Rd | 0.002702702703 Ci |
| 1000 Rd | 0.02702702703 Ci |
Where it's used
Rutherfords are used for older nuclear physics literature, while curies appear in US nuclear regulation and licences. Both measure activity of a radioactive source, so the conversion is a fixed factor.
Rutherford to other radioactivity units
| Conversion | 1 Rd equals |
|---|---|
| rutherford to curie | 0.00002702702703 Ci |
| rutherford to becquerel | 1000000 Bq |
| rutherford to megabecquerel | 1 MBq |
| rutherford to millicurie | 0.02702702703 mCi |
| rutherford to picocurie | 27027027.03 pCi |
| rutherford to kilobecquerel | 1000 kBq |
| rutherford to gigabecquerel | 0.001 GBq |
| rutherford to microcurie | 27.02702703 µCi |
Show 3 more units
| rutherford to disintegration per minute | 60000000 dpm |
|---|---|
| rutherford to terabecquerel | 0.000001 TBq |
| rutherford to nanocurie | 27027.02703 nCi |
Frequently asked questions
How many curies are in 1 rutherford?
1 Rd = 0.00002702702703 Ci.
How do I convert rutherfords to curies?
Multiply the value in Rd by 0.00002702702703, or divide it by 37000. For example, 15 Rd × 0.00002702702703 = 0.0004054054054 Ci.
Is the Rd to Ci conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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 Rutherfords to Curies (Rd to Ci). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/rutherfords-to-curies/
IEEE
Scientific Converters, "Convert Rutherfords to Curies (Rd to Ci)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/rutherfords-to-curies/