Convert Curies to Rutherfords
Convert Curies (Ci) to Rutherfords (Rd) instantly and accurately.
Conversion Formula
Rd = Ci × 37000
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.
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 Superseded by the MBq in SI but still encountered in older nuclear physics and reactor engineering literature. 1 Rd = 10⁶ Bq.
Quick Reference Table
| Curies (Ci) | Rutherfords (Rd) |
|---|---|
| 1 Ci | 37000 Rd |
| 2 Ci | 74000 Rd |
| 5 Ci | 185000 Rd |
| 10 Ci | 370000 Rd |
| 25 Ci | 925000 Rd |
| 50 Ci | 1850000 Rd |
| 100 Ci | 3700000 Rd |