Convert between becquerel (Bq), curie (Ci), GBq, MBq, mCi, µCi, rutherford and all radioactivity units — including bq to ci, curie to becquerel, mci to bq, gbq to mci, and more.
Whether you need a quick bq to ci calculation, want to convert curies to becquerels for a nuclear medicine dose, or need to do a millicurie to gbq conversion for a PET scan prescription, the cards below give you exact formulas and real-world context for every common radiation unit conversion.
For a bq to ci conversion, divide the becquerel value by 3.7 × 10¹⁰. The bq to curie result is always a very small number since one curie represents an enormous decay rate. This bq to ci conversion is used when expressing source strength in legacy units.
Ci = Bq ÷ 3.7 × 10¹⁰
To convert ci to bq, multiply by 3.7 × 10¹⁰. The curie to becquerel conversion is fundamental to nuclear medicine: 1 Ci = 37 GBq. The same factor applies when you need to convert ci to bq for regulatory submissions or scientific publications.
Bq = Ci × 3.7 × 10¹⁰
Converting becquerels to curies (or convert curies to becquerels in reverse) uses the same factor. When dealing with environmental contamination levels or food safety limits, becquerel to curie conversion is often needed to compare international standards with US legacy regulations.
1 Ci = 3.7 × 10¹⁰ Bq | 1 Bq = 2.703 × 10⁻¹¹ Ci
The mci to bq conversion multiplies by 3.7 × 10⁷. For example, a typical diagnostic nuclear medicine dose of 10 mCi equals 370 MBq. You can also do bq to mci by dividing Bq by 3.7 × 10⁷.
1 mCi = 37,000,000 Bq = 37 MBq
For gbq to mci conversion, multiply by 27.027. For example, 1 GBq = 27.027 mCi. The gbq to mci factor is crucial in nuclear medicine PET dosing, where activities are routinely prescribed in both GBq (Europe/SI) and mCi (US).
mCi = GBq × 27.027
Millicurie to gbq conversion divides by 27.027 (or multiplies by 0.037). For example, 10 mCi = 0.37 GBq = 370 MBq. The millicurie to gbq formula is the most common conversion in modern nuclear medicine pharmacy.
GBq = mCi × 0.037
When converting microcuries to becquerels, multiply by 37,000. For example, 1 µCi = 37,000 Bq = 37 kBq. The reverse — uci to bq or bq to uci — divides by 37,000. Also used: kbq to uci (divide by 37).
1 µCi = 37,000 Bq = 37 kBq
For gbq to ci, multiply by 0.027027. Since 1 Ci = 37 GBq, the gbq to ci conversion is straightforward: divide GBq by 37. Also useful: mci to gbq (multiply mCi by 0.037) and gbq radiation levels in therapy contexts.
Ci = GBq × 0.027027 | 1 Ci = 37 GBq
The bq unit (becquerel) is the SI unit of radioactivity. One bq radiation event equals one nuclear disintegration per second. Understanding bq units and bq radioactivity is essential for interpreting environmental radiation reports, food safety limits, and nuclear medicine prescriptions.
1 Bq = 1 disintegration/second
The mbq unit (megabecquerel, 10⁶ Bq) and gbq radiation unit (gigabecquerel, 10⁹ Bq) are the most common units in nuclear medicine. Mbq to gbq: divide by 1,000. Gbq radiation levels are used for therapy doses (e.g., I-131 thyroid ablation: 3.7–7.4 GBq).
1 GBq = 1,000 MBq | 1 MBq = 1,000 kBq
The radioactive unit and radioactivity unit most widely used today is the becquerel (Bq). The curie (Ci) remains the dominant radioactive unit in US industrial and medical practice. The mci measurement unit is standard for nuclear medicine diagnostic doses.
This radiation conversion calculator handles all radioactivity radiation conversion units: Bq, kBq, MBq, GBq, TBq, Ci, mCi, µCi, nCi, pCi, rutherford, and disintegrations per second or minute. As a complete radiation converter calculator, it covers every converting radiation units scenario from environmental monitoring to nuclear medicine.
Complete radiation measurement units conversion table covering all major radioactivity unit pairs.
| Conversion | Formula | Example | Use Case |
|---|---|---|---|
| Bq to Ci | Ci = Bq ÷ 3.7×10¹⁰ | 3.7×10¹⁰ Bq = 1 Ci | SI to legacy unit |
| Curie to Becquerel | Bq = Ci × 3.7×10¹⁰ | 1 Ci = 37 GBq | Nuclear medicine, industrial |
| mCi to Bq | Bq = mCi × 3.7×10⁷ | 1 mCi = 37 MBq | Diagnostic nuclear medicine |
| GBq to mCi | mCi = GBq × 27.027 | 1 GBq = 27.03 mCi | PET/SPECT imaging doses |
| Millicurie to GBq | GBq = mCi × 0.037 | 10 mCi = 0.37 GBq | Radiopharmacy prescriptions |
| µCi to Bq | Bq = µCi × 37,000 | 1 µCi = 37 kBq | Environmental, lab work |
| GBq to Ci | Ci = GBq × 0.027027 | 37 GBq = 1 Ci | Therapy source calibration |
| MBq to GBq | GBq = MBq ÷ 1,000 | 1,000 MBq = 1 GBq | Dose prescription |
| Ci to Bq conversion | Bq = Ci × 3.7×10¹⁰ | 0.1 Ci = 3.7 GBq | Convert ci to bq |
| Bq to Ci conversion | Ci = Bq ÷ 3.7×10¹⁰ | 370 MBq = 10 mCi | Convert bq to ci |
1 curie in bq equals exactly 3.7 × 10¹⁰ becquerels (37,000,000,000 Bq or 37 GBq). This value was originally defined as the activity of one gram of radium-226 and remains the definitive becquerel to curie conversion factor used worldwide.
Conversely, when performing a ci to bq conversion, you always multiply by 37 billion. The curie to becquerel conversion table below shows common values:
| Curie Value | Becquerel (Bq) | GBq | MBq |
|---|---|---|---|
| 0.001 Ci (1 mCi) | 37,000,000 Bq | 0.037 GBq | 37 MBq |
| 0.01 Ci (10 mCi) | 370,000,000 Bq | 0.37 GBq | 370 MBq |
| 0.1 Ci (100 mCi) | 3,700,000,000 Bq | 3.7 GBq | 3,700 MBq |
| 1 Ci | 37,000,000,000 Bq | 37 GBq | 37,000 MBq |
| 10 Ci | 370,000,000,000 Bq | 370 GBq | 370,000 MBq |
The becquerel unit is the SI unit of radioactivity: one disintegration per second. 1 Bq = 1 dis/s. The bq unit is used universally in scientific literature, environmental monitoring, and European medical practice. Bq radiation levels in food are typically expressed in Bq/kg.
The curie is a non-SI radioactive unit. 1 Ci = 3.7 × 10¹⁰ Bq = 37 GBq. Named after Marie and Pierre Curie. A curie to becquerel conversion always multiplies by 37 billion. The curie remains dominant in US nuclear medicine, industrial radiography, and radiation safety regulations.
The millicurie is the standard mci measurement unit for nuclear medicine diagnostic doses. 1 mCi = 0.001 Ci = 37 MBq. Mci to bq: multiply by 3.7 × 10⁷. Mci to gbq: multiply by 0.037.
The gigabecquerel (gbq radiation unit) and megabecquerel (mbq unit) are the preferred radioactivity unit values in modern nuclear medicine. Gbq to mci: multiply by 27.027. Mbq to gbq: divide by 1,000.
A non-SI radioactive unit. 1 Rd = 1 MBq = 10⁶ Bq. Named after Ernest Rutherford. Rarely used today but occasionally encountered in older nuclear physics literature.
| Unit | Equivalent To | Common Usage |
|---|---|---|
| 1 Ci (curie) | 3.7 × 10¹⁰ Bq = 37 GBq | Nuclear medicine, industrial |
| 1 mCi (millicurie) | 3.7 × 10⁷ Bq = 37 MBq | Diagnostic nuclear medicine |
| 1 µCi (microcurie) | 37,000 Bq = 37 kBq | Lab tracers, environmental |
| 1 GBq (gigabecquerel) | 27.027 mCi | PET imaging, therapy |
| 1 MBq (megabecquerel) | 0.027027 mCi = 27.027 µCi | SPECT imaging |
| 1 kBq (kilobecquerel) | 0.027027 µCi | Environmental monitoring |
| 1 Rd (rutherford) | 1 MBq | Historic nuclear physics |
For a bq to ci conversion, divide the Bq value by 3.7 × 10¹⁰. For example, 3.7 × 10¹⁰ Bq ÷ 3.7 × 10¹⁰ = 1 Ci. Use the radiation converter calculator above for any bq to curie result instantly. The bq to ci conversion factor is always 1 Ci = 37 billion Bq.
To convert curie to becquerel, multiply the Ci value by 3.7 × 10¹⁰. For example, 1 Ci × 3.7 × 10¹⁰ = 37,000,000,000 Bq = 37 GBq. This is the standard curie to becquerel conversion used worldwide in nuclear medicine and radiation safety.
Becquerels to curies: divide by 3.7 × 10¹⁰. Convert curies to becquerels: multiply by 3.7 × 10¹⁰. The becquerel to curie conversion and its reverse are the two most common conversion of radiation units in nuclear medicine. Ci to bq conversion and bq to ci conversion are exact inverses.
The mci to bq conversion multiplies by 37,000,000 (3.7 × 10⁷). For example, 5 mCi × 3.7 × 10⁷ = 185,000,000 Bq = 185 MBq. To do bq to mci, divide by 3.7 × 10⁷. The mci to bq formula is the most common radiation measurement conversion in clinical nuclear medicine.
GBq to mCi conversion: multiply GBq by 27.027. For example, 3.7 GBq × 27.027 = 100 mCi. This gbq to mci factor (27.027) is the reciprocal of the millicurie to gbq factor (0.037). Both are essential in nuclear medicine PET imaging where doses are prescribed in both systems.
The millicurie to gbq conversion multiplies mCi by 0.037. For example, 200 mCi × 0.037 = 7.4 GBq. The reverse — mci to gbq — uses the same factor. This conversion is critical in radiopharmacy, where I-131 therapy doses are often expressed in both mCi (US) and GBq (international).
To convert microcuries to becquerels, multiply by 37,000. For example, 1 µCi = 37,000 Bq = 37 kBq. For the reverse (uci to bq and bq to uci), multiply or divide by 37,000. The kbq to uci conversion divides kBq by 37.
For gbq to ci, multiply GBq by 0.027027 (or divide by 37). For example, 37 GBq = 1 Ci, and 3.7 GBq = 0.1 Ci = 100 mCi. The gbq to ci conversion is used in brachytherapy source calibration and industrial gamma radiography.
The bq unit (becquerel) is the SI unit of radioactivity, equal to one nuclear decay per second. The radioactivity unit Ci (curie) equals 3.7 × 10¹⁰ Bq. The bq unit is used in international scientific and environmental contexts, while the curie remains standard in US medicine and industry. Both are legitimate radiation conversion units.
1 curie in bq = 3.7 × 10¹⁰ Bq = 37,000,000,000 Bq = 37 GBq. This is the exact ci to bq conversion factor defined by the IAEA. Any curie to bq or convert ci to bq calculation uses this fundamental value.
The mbq unit (megabecquerel) = 10⁶ Bq, and the gigabecquerel (GBq) = 10⁹ Bq. These are the standard radioactivity unit values in modern nuclear medicine. Mbq to gbq: divide by 1,000. To convert mbq to uci: multiply by 27.027. Gbq radiation levels (3.7–7.4 GBq) are typical for I-131 thyroid cancer therapy.