Convert microgray [µGy] to millirad [mrd] Online | Free radiation-absorbed-dose Converter

Microgray [µGy]: A Small Unit for Measuring Radiation Exposure

The microgray (µGy) is a unit of absorbed radiation dose equal to 10⁻⁶ grays (Gy), or one-millionth of a gray. The gray (Gy) is the SI unit used to measure how much ionizing radiation energy is absorbed per kilogram of matter. A microgray represents a very small amount of absorbed radiation, making it useful in situations involving low-dose exposure. This unit is commonly used in environmental monitoring, radiological protection, and diagnostic radiology, where understanding and controlling low radiation levels is important. For example, background radiation from natural sources like soil, cosmic rays, or building materials can be measured in micrograys. In medical contexts, certain diagnostic procedures such as dental X-rays or mammograms may deliver doses in the µGy range. Though small, even low levels of ionizing radiation can have cumulative effects, especially over long periods or in sensitive populations. The microgray allows for precise measurement and monitoring of these exposures, helping ensure safety standards are met. Its use supports regulatory compliance, public health, and scientific research related to low-level radiation and its biological effects.

Millirad [mrd]: A Subunit of Radiation Absorbed Dose

The millirad (mrd) is a unit of absorbed radiation dose equal to one-thousandth of a rad. The rad (radiation absorbed dose) is an older, non-SI unit that was commonly used before the gray (Gy) became the standard.

• 
  

  1 rad = 0.01 gray (Gy)

  
  
• 
  

  Therefore, 1 millirad = 0.001 rad = 0.00001 Gy (10⁻⁵ Gy)

  
  

The millirad was used to measure the amount of energy absorbed from ionizing radiation per unit mass, primarily in radiation protection and medical contexts.

Though the rad and its subunits like the millirad have largely been replaced by the gray and its subunits (milligray, microgray, etc.), they may still be encountered in older literature or certain regions.

In summary, the millirad is a very small dose unit equal to one-thousandth of a rad, useful historically for quantifying low-level radiation exposures before the universal adoption of the gray.