Rads to Grays Converter (rad to Gy)
Rads to Grays Converter (rad to Gy)
Convert Rads (rad) to Grays (Gy) instantly. Divide rads by 100 to convert legacy radiological measurements into standard International System (SI) grays.
How to Use This Converter
- Enter the value in Rads (rad) you want to convert.
- Ensure the “From” selector is set to Rads (rad).
- Ensure the “To” selector is set to Grays (Gy).
- The converted absorbed dose in Grays (Gy) calculates instantly in the result box.
Rads (rad) to Grays (Gy) Formula
To convert from Rads (rad) to Grays (Gy), use the exact physical definition relationship:
Primary Formula:
Gy = rad / 100 (or Gy = rad × 0.01)
Calculation Examples
- Example 1: 100 rad = 1 Gy
- Example 2: 200 rad = 2 Gy
- Example 3: 450 rad = 4.5 Gy
- Example 4: 1,000 rad = 10 Gy
Rads (rad) to Grays (Gy) Conversion Table
| Rads (rad) | Grays (Gy) |
|---|---|
| 1 rad | 0.01 Gy |
| 5 rad | 0.05 Gy |
| 10 rad | 0.1 Gy |
| 50 rad | 0.5 Gy |
| 100 rad | 1 Gy |
| 200 rad | 2 Gy |
| 500 rad | 5 Gy |
| 1,000 rad | 10 Gy |
Frequently Asked Questions
How many Rads are in 1 Gray?
Exactly 100 Rads. One Gray equals 100 Rads (1 Gy = 100 rad). Conversely, 1 Rad equals 0.01 Grays (1 rad = 0.01 Gy = 10 mGy).
What is the difference between Absorbed Dose (Gy) and Equivalent Dose (Sv)?
Absorbed dose (measured in Grays or rads) quantifies the pure physical energy deposited in matter (1 Gy = 1 J/kg). Equivalent dose (measured in Sieverts or rem) multiplies absorbed dose by a radiation weighting factor (W_R) to reflect the biological severity of specific radiation types (e.g., alpha particles have W_R = 20, whereas photons have W_R = 1).
Why did the Gray replace the Rad in scientific standards?
The International Commission on Radiation Units and Measurements (ICRU) and the General Conference on Weights and Measures (CGPM) adopted the Gray in 1975 to integrate radiation dosimetry directly into the coherent SI metric framework (joules per kilogram), eliminating cumbersome CGS conversion factors.