Convert Rutherfords to Curies
Convert Rutherfords (Rd) to Curies (Ci) instantly and accurately.
Conversion Formula
Ci = Rd × 2.702702703e-5
About Rutherfords
The rutherford (Rd) equals exactly 10⁶ Bq = 1 MBq. Proposed by Ernest Rutherford and adopted at the 1946 Montreal Conference on Radioactivity as a convenient unit for large sources. Superseded by the MBq in SI but still encountered in older nuclear physics and reactor engineering literature. 1 Rd = 10⁶ Bq.
About Curies
The curie (Ci) equals exactly 3.7 × 10¹⁰ Bq = 37 GBq, originally defined as the activity of 1 g of ²²⁶Ra. Still widely used in the US: ⁶⁰Co teletherapy sources are 5000-15000 Ci; ¹³⁷Cs blood irradiators are 1000-40000 Ci; NRC source licences for industrial radiography cite Ci limits. 1 Ci = 3.7 × 10¹⁰ Bq.
Quick Reference Table
| Rutherfords (Rd) | Curies (Ci) |
|---|---|
| 1 Rd | 2.703 × 10-5 Ci |
| 2 Rd | 5.405 × 10-5 Ci |
| 5 Rd | 0.000135135 Ci |
| 10 Rd | 0.00027027 Ci |
| 25 Rd | 0.000675676 Ci |
| 50 Rd | 0.00135135 Ci |
| 100 Rd | 0.0027027 Ci |