Gray
The gray or Gy is the official SI unit for absorbed dose which measures the amount of ionizing radiation that has been absorbed by any material.[1] However, Gy can be used to measure any form of radiation except for the biological effects of the different forms of radiations.[2] Gy is measured in joules per kilogram or J/kg. Before the establishment of Gy as the official SI unit for absorbed dose, the non-SI unit radiation absorbed dose or rad was used. One gray is equivalent to one hundred rads or 1 Gy = 100 rad.[3]
The following table shows radiation quantities in SI and non-SI units.[4][5]
| Quantity | Name | Symbol | Unit | System |
|---|---|---|---|---|
| Exposure | Roentgen | R | 2.58x10-6 C/kg | Non-SI |
| Absorbed Dose | Rad Gray |
rad Gy |
10-2 Gy Jkg-1 |
Non-SI SI |
| Activity | Curie Becquerel |
Ci Bq |
3.7x1010 Bq s-1 |
Non-SI SI |
| Dose Equivalent | Roentgen Equivalent Man Sievert |
rem Sv |
10-2 Sv Jkg-1 |
Non-SI SI |
Gray Unit Converter
For Further Reading
- Radiation
- Nuclear energy
- Fission
- Uranium
- Or explore a random page
References
- ↑ U.S.NRC (06, 21, 2016). Gray (Gy) [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/glossary/gray-gy.html
- ↑ OCW.MIT, Lecture Notes, “Electromagnetic Radiation”, Fall 2004. [Online]. Available: http://ocw.mit.edu/courses/nuclear-engineering/22-55j-principles-of-radiation-interactions-fall-2004/lecture-notes/intro_absorb_dos.pdf
- ↑ U.S.NRC(06, 21. 2016). Rad (radiation absorbed dose) [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/glossary/rad-radiation-absorbed-dose.html
- ↑ NIST. (2016, February 10). Chapter 5. Guide to the SI, Units Outside the SI [Online]. Available: http://www.nist.gov/pml/pubs/sp811/sec05.cfm
- ↑ NIST. (2016, February 19). Chapter 4. Guide to the SI, The Two Classes of SI Units and the SI Prefixes [Online]. Available: http://www.nist.gov/pml/pubs/sp811/sec04.cfm