Radioactivity and dose converter
Becquerels and curies, grays and rads, sieverts and rems, three distinct quantities.
Result
2.7027 × 10⁻¹¹ Ci
- Formula
- 1 Bq = 2.702 702 703 × 10⁻¹¹ Ci
Raw value: 2.70270e-11
Calculation, assumptions and sources
OverviewA radioactivity (becquerel, curie and their multiples), an absorbed dose (gray, rad) or an equivalent dose (sievert, rem), converted between its units.
A radioactivity (becquerel, curie and their multiples), an absorbed dose (gray, rad) or an equivalent dose (sievert, rem), converted between its units.
Method & formulas1 Bq = 1 disintegration per second
The becquerel counts disintegrations, the gray measures energy deposited per unit mass, and the sievert weights that deposit by a factor w_R specific to the radiation (1 for photons and electrons, up to 20 for alpha particles). Gray and sievert have the same dimension, J/kg, but are not interchangeable.
- Bq
- Becquerel (Bq)
- kBq
- Kilobecquerel (kBq)
- MBq
- Megabecquerel (MBq)
- GBq
- Gigabecquerel (GBq)
- TBq
- Terabecquerel (TBq)
- Ci
- Curie (Ci)
- mCi
- Millicurie (mCi)
- µCi
- Microcurie (µCi)
- µGy
- Microgray (µGy)
- mGy
- Milligray (mGy)
- Gy
- Gray (Gy)
- kGy
- Kilogray (kGy)
- rad
- Rad (rad)
- nSv
- Nanosievert (nSv)
- µSv
- Microsievert (µSv)
- mSv
- Millisievert (mSv)
- Sv
- Sievert (Sv)
- rem
- Rem (rem)
- Ci
- Non-SI unit, defined as exactly 3.7 × 10¹⁰ Bq. This value comes from a historical definition (approximate activity of one gram of radium-226), not from SI coherence.
Validity domainGoing from absorbed to equivalent dose requires the radiation weighting factor w_R; going to effective dose additionally requires tissue weighting factors.
Going from absorbed to equivalent dose requires the radiation weighting factor w_R; going to effective dose additionally requires tissue weighting factors. A default w_R = 1 would be right for photons and wrong by a factor of 20 for an alpha emitter. The three quantities are not converted into one another.