Convert Microrads to Grays
Convert Microrads (µrad) to Grays (Gy) instantly and accurately.
Conversion Formula
Gy = µrad × 1.000000000e-8
About Microrads
The microrad (µrad) equals 10⁻⁶ rad = 10⁻⁸ Gy. Used in legacy US radiological instrumentation calibration documentation for very low-level survey instrument thresholds; some older NRC and EPA radiation protection records quote environmental dose rates in µrad/h when modern instruments report nGy/h. 1 µrad = 10⁻⁸ Gy = 10⁻² µGy.
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.
Quick Reference Table
| Microrads (µrad) | Grays (Gy) |
|---|---|
| 1 µrad | 1 × 10-8 Gy |
| 2 µrad | 2 × 10-8 Gy |
| 5 µrad | 5 × 10-8 Gy |
| 10 µrad | 1 × 10-7 Gy |
| 25 µrad | 2.5 × 10-7 Gy |
| 50 µrad | 5 × 10-7 Gy |
| 100 µrad | 1 × 10-6 Gy |