Convert teragray [TGy] to millirad [mrd] Online | Free radiation-absorbed-dose Converter

Teragray [TGy]: An Ultra-Extreme Radiation Dose Unit

The teragray (TGy) is a unit of absorbed radiation dose equal to 1 trillion grays (10¹² Gy). This represents an inconceivably massive amount of radiation energy absorbed per kilogram of matter, far beyond any dose encountered in practical, medical, or even most scientific contexts.

Teragrays are relevant only in the most extreme theoretical and experimental scenarios, such as:

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  Modeling radiation effects in high-energy astrophysics, including phenomena near black holes, neutron stars, or gamma-ray bursts.

  
  
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  Simulating conditions inside nuclear explosions or ultra-high-energy particle collisions.

  
  
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  Exploring fundamental radiation-matter interactions at cosmic or subatomic scales in advanced physics research.

  
  

At the TGy scale, all known forms of matter would be completely obliterated or transformed at the atomic level, and conventional concepts of radiation damage no longer apply.

The teragray unit serves as a conceptual boundary in the SI radiation dose scale, highlighting the incredible range—from the tiniest doses affecting cells to the extreme energies involved in cosmic events and high-energy physics. It underscores how the gray can theoretically extend to measure energy absorption across all imaginable magnitudes.

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.

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  1 rad = 0.01 gray (Gy)

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Though the rad and its subunits like the millirad have largely been replaced by the gray and its subunits (milligray, microgray, etc.), they may still be encountered in older literature or certain regions.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