Radiation Dose Converter

13 units

Convert between different units of radiation dose including gray, sievert, rad, and rem for medical and safety applications with precision.

Precision Control
Adjust decimal precision for your conversion needs

Quick

0 decimals

Rounded to whole numbers

Rough estimates and quick calculations

123
Example

Standard

2 decimals

Two decimal places

Most everyday conversions

123.46
Example

Precise

4 decimals

Four decimal places

Scientific and engineering work

123.4568
Example

Current Precision

Standard mode active

2 decimals

Popular Radiation Dose Unit Conversions

Common radiation dose unit conversions used in medical physics, radiation safety, and nuclear medicine.

Gray ↔ Rad
1 Gy100 rad
1 rad0.01 Gy
Sievert ↔ Rem
1 Sv100 rem
1 rem0.01 Sv
mSv ↔ mrem
1 mSv100 mrem
1 mrem0.01 mSv
mGy ↔ mrad
1 mGy100 mrad
1 mrad0.01 mGy
Complete Radiation Dose Conversion Guide
Understanding absorbed vs equivalent dose and radiation protection principles

Understanding Absorbed vs Equivalent Dose

Radiation dose measurements serve different purposes in medical physics and radiation safety:

  • A
    Absorbed Dose (Gray/Rad): Energy deposited per unit mass of tissue. Used in radiotherapy planning and dosimetry calculations.
  • E
    Equivalent Dose (Sievert/Rem): Absorbed dose weighted by radiation type. Accounts for biological effectiveness of different radiations.

SI vs Traditional Units

Modern radiation protection uses SI units, while traditional units remain common in some regions:

SI Units
Absorbed: Gray (Gy)
Equivalent: Sievert (Sv)
Traditional
Absorbed: Rad
Equivalent: Rem
Conversion Factors
1 Gy = 100 rad | 1 Sv = 100 rem

Essential Conversion Factors

Fundamental relationships and conversion factors for radiation dose measurements.

Core Conversion Formulas
Primary Relationships
1 Gray = 100 Rad (absorbed dose)
1 Sievert = 100 Rem (equivalent dose)
For Gamma/X-rays
1 Gray ≈ 1 Sievert (wR = 1)
1 mGy100 mrad
1 mSv100 mrem
1 μGy0.1 mrad
Radiation Weighting Factors
Factors used to convert absorbed dose to equivalent dose:
Gamma rays, X-rays
wR = 1
Beta particles
wR = 1
Alpha particles
wR = 20
Neutrons (thermal)
wR = 2.5
Neutrons (fast)
wR = 10-20

Professional Applications

Radiation dose measurements are critical across medical, industrial, and research applications.

Medical Physics
  • • Radiotherapy treatment planning
  • • Diagnostic imaging optimization
  • • Patient dose calculations
  • • Quality assurance protocols
  • • Dose verification systems
Radiation Safety
  • • Occupational dose monitoring
  • • Area radiation surveys
  • • Personal dosimetry programs
  • • ALARA implementation
  • • Emergency response planning
Nuclear Medicine
  • • Patient dose calculations
  • • Staff radiation protection
  • • Radiopharmaceutical dosing
  • • Therapy dose planning
  • • Regulatory compliance
Industrial Radiography
  • • NDT safety protocols
  • • Gauge source applications
  • • Worker dose monitoring
  • • Facility shielding design
  • • Transportation safety
Environmental Monitoring
  • • Emergency response assessment
  • • Contamination surveys
  • • Public dose evaluation
  • • Environmental impact studies
  • • Cleanup verification
Regulatory Compliance
  • • NRC dose limit compliance
  • • FDA medical device regulations
  • • OSHA occupational safety
  • • International standards (ICRP)
  • • State regulatory requirements

Common Radiation Dose Examples

Typical radiation dose levels encountered in medical procedures, occupational settings, and daily life.

Medical Procedures
Chest X-ray
~0.1 mSv
Dental X-ray
~0.005 mSv
CT chest scan
~7 mSv
CT abdomen
~10 mSv
Radiotherapy fraction
1.8-2 Gy
Background & Natural
Natural background (annual)
2-3 mSv
Cosmic radiation (flight)
~0.005 mSv/hr
Radon exposure (home)
~2 mSv/yr
Terrestrial radiation
~0.5 mSv/yr
Internal radiation
~0.3 mSv/yr
Occupational Exposure
Nuclear worker (typical)
~2-5 mSv/yr
Medical worker
~1-3 mSv/yr
Airline crew
~2-5 mSv/yr
Industrial radiographer
~5-15 mSv/yr
Research scientist
~0.5-2 mSv/yr

Dose Limits and Safety Standards

Regulatory dose limits and safety standards for radiation protection in various scenarios.

Regulatory Dose Limits
Public Exposure
Annual limit1 mSv/year
Lifetime limit70 mSv
Occupational Exposure
Annual limit50 mSv/year
5-year average20 mSv/year
Special Populations
Pregnant Workers
Pregnancy limit5 mSv total
Monthly limit0.5 mSv/month
Medical Procedures
No dose limitsJustified benefit
ALARA principleAlways applies