Convert Curies to Femtobecquerels
Convert Curies (Ci) to Femtobecquerels (fBq) instantly and accurately.
Conversion Formula
fBq = Ci × 3.700000000e+25
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 Femtobecquerels
The femtobecquerel (fBq) equals 10⁻¹⁵ Bq, used in accelerator mass spectrometry (AMS) to quantify cosmogenic radionuclides (¹⁰Be, ³⁶Cl) in ice cores and geological samples. Ultra-low-background counting in deep underground laboratories reaches the fBq/kg level for solar neutrino detector purity assessment. 1 fBq = 10⁻¹⁵ Bq = 10⁻³ pBq.
Quick Reference Table
| Curies (Ci) | Femtobecquerels (fBq) |
|---|---|
| 1 Ci | 3.7 × 1025 fBq |
| 2 Ci | 7.4 × 1025 fBq |
| 5 Ci | 1.85 × 1026 fBq |
| 10 Ci | 3.7 × 1026 fBq |
| 25 Ci | 9.25 × 1026 fBq |
| 50 Ci | 1.85 × 1027 fBq |
| 100 Ci | 3.7 × 1027 fBq |