Convert Grays to Femtograys
Convert Grays (Gy) to Femtograys (fGy) instantly and accurately.
Conversion Formula
fGy = Gy × 1000000000000000
About Grays
The gray (Gy) is the SI coherent unit of absorbed radiation dose, defined as 1 joule of energy deposited per kilogram of matter. Named after Harold Gray (British radiobiologist, 1905-1965). Used globally in radiotherapy: curative tumour doses 40-80 Gy fractionated; total body irradiation before bone marrow transplant 12-14 Gy. 1 Gy = 1 J/kg = 100 rad.
About Femtograys
The femtogray (fGy) equals 10⁻¹⁵ Gy, used in radiation biology to characterise the dose deposited by a single low-energy Auger electron cascade or a single traversal of a low-LET particle through a cell nucleus. Monte Carlo microdosimetry simulations of targeted radionuclide therapy report subcellular doses at the fGy level. 1 fGy = 10⁻¹⁵ Gy = 10⁻³ pGy.
Quick Reference Table
| Grays (Gy) | Femtograys (fGy) |
|---|---|
| 1 Gy | 1 × 1015 fGy |
| 2 Gy | 2 × 1015 fGy |
| 5 Gy | 5 × 1015 fGy |
| 10 Gy | 1 × 1016 fGy |
| 25 Gy | 2.5 × 1016 fGy |
| 50 Gy | 5 × 1016 fGy |
| 100 Gy | 1 × 1017 fGy |