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Radioactivity Conversion
Tool Description
Radioactivity Conversion is an online radioactivity unit converter that supports mutual conversion between commonly used radioactivity units such as Becquerel (Bq), Kilobecquerel (kBq), Megabecquerel (MBq), Gigabecquerel (GBq), Terabecquerel (TBq), Curie (Ci), Millicurie (mCi), Microcurie (μCi), Nanocurie (nCi), Disintegrations per Minute (dpm), and Rutherford (Rd). Enter any value and unit to instantly view corresponding results in all other units — ideal for professionals in nuclear medicine, radiation protection, environmental monitoring, and scientific research & education.
How to Use
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Enter a value
Input the radioactivity value you want to convert in the input field. Supports integers, decimals, and scientific notation like
100,3.7e10 -
Choose the unit
Select the unit of your input value from the "Source Unit" dropdown list (Bq, kBq, MBq, GBq, TBq, Ci, mCi, μCi, nCi, dpm, Rd)
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View results
Click the "Convert" button or press Enter. All equivalent values in other units will be displayed below, with individual copy buttons next to each result
Use Cases
- Nuclear Medicine & Radiotherapy: Physicians and physicists need to convert radiopharmaceutical activity between Bq and Ci, as iodine-131 therapy doses are often prescribed in mCi while international standards use Bq
- Environmental Radiation Monitoring: Radionuclide concentrations in environmental samples are typically expressed in Bq/kg or Bq/L, requiring comparison and conversion with regulatory limits that may use Ci units
- Research & Education: Physics, chemistry, and nuclear engineering students need to understand conversion relationships between different radioactivity units during coursework and laboratory exercises
Key Advantages
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Free Daily Allowance
Free daily usage credits are provided so casual, light conversion needs can be met at zero cost without paying for occasional use.
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Privacy & Security
All conversions run entirely in your browser. Your input values are never uploaded to any server, protecting your data privacy 100%.
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Comprehensive Coverage
Supports 11 radioactivity units including Bq, Ci, mCi, μCi, nCi, dpm, and Rd. Enter a value once and instantly see results in every unit, meeting medical, environmental, and many other needs.
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Ready to Use
No installation or registration required. Open your browser and use it directly on computers, phones, and tablets across all platforms.
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Simple & Easy
Enter a value, choose a unit, and convert in just three steps. Results are clearly displayed and can be copied with one click.
Radioactivity Unit Conversion Relationships
The following table shows the conversion relationships between common radioactivity units, referenced to Becquerel (Bq):
| Unit Name | Abbreviation | Conversion | Equivalent Bq |
|---|---|---|---|
| Becquerel | Bq | 1 Bq = 1 次衰变/秒 | 1 |
| Kilobecquerel | kBq | 1 kBq = 10³ Bq | 1,000 |
| Megabecquerel | MBq | 1 MBq = 10⁶ Bq | 1,000,000 |
| Gigabecquerel | GBq | 1 GBq = 10⁹ Bq | 1,000,000,000 |
| Terabecquerel | TBq | 1 TBq = 10¹² Bq | 1,000,000,000,000 |
| Curie | Ci | 1 Ci = 3.7×10¹⁰ Bq | 37,000,000,000 |
| Millicurie | mCi | 1 mCi = 3.7×10⁷ Bq | 37,000,000 |
| Microcurie | μCi | 1 μCi = 37,000 Bq | 37,000 |
| Nanocurie | nCi | 1 nCi = 37 Bq | 37 |
| Disintegrations per Minute | dpm | 1 dpm = 1/60 Bq | ≈ 0.0167 |
| Rutherford | Rd | 1 Rd = 10⁶ Bq | 1,000,000 |
Comparing Bq and Ci Systems
Becquerel (Bq) and Curie (Ci) are the two main unit systems for radioactivity. Becquerel (Bq) is the SI derived unit, defined as one radioactive decay per second. Curie (Ci) is a historical non-SI unit, originally defined as the activity of 1 gram of radium-226 (approximately 3.7×10¹⁰ decays per second). While international standards recommend using Bq, Ci and its submultiples remain widely used in medical practice.
The conversion between the two systems is: 1 Ci = 3.7 × 10¹⁰ Bq, or 1 Bq ≈ 2.7 × 10⁻¹¹ Ci. Here is a quick reference table:
| Unit | Equivalent Value | Typical Application |
|---|---|---|
| 1 nCi | 37 Bq | Environmental trace radioactivity detection |
| 1 μCi | 37 kBq | Laboratory tracer experiments |
| 1 mCi | 37 MBq | Nuclear medicine diagnostic doses |
| 1 Ci | 37 GBq | Radiotherapy sources, irradiation facilities |
FAQ
Becquerel (Bq) is the SI unit of radioactivity, defined as one decay per second. Curie (Ci) is a traditional unit, with 1 Ci = 3.7 × 10¹⁰ Bq (37 billion decays per second). Bq values tend to be large numbers while Ci values are relatively small. For example, 1 mCi = 37 MBq. In scientific literature and international standards, Bq is the recommended unit.
1 mCi (millicurie) = 3.7 × 10⁷ Bq = 37 MBq (megabecquerel). 1 μCi (microcurie) = 3.7 × 10⁴ Bq = 37 kBq (kilobecquerel). This conversion is extremely common in nuclear medicine, as radioactive tracer and diagnostic drug doses are often prescribed in mCi or μCi, while international reporting standards typically require Bq.
dpm (disintegrations per minute) is a commonly used unit in radioactivity measurement. Its relationship with Bq (disintegrations per second) is: 1 Bq = 60 dpm, or 1 dpm = 1/60 Bq ≈ 0.0167 Bq. dpm is frequently used in techniques such as liquid scintillation counting, where measuring instruments typically count events per minute.
Rutherford (Rd) is an obsolete unit of radioactivity named after physicist Ernest Rutherford. 1 Rd = 10⁶ Bq = 1 MBq. This unit was proposed in 1946 but was never widely adopted and is now virtually unused. This tool includes the Rd unit primarily for historical reference and academic research purposes.
No. All conversion calculations are performed entirely in your browser using pure JavaScript mathematical computation. Your input data never leaves your device. You can use this tool with complete confidence in your privacy.
Yes. You can directly enter values in scientific notation format, such as 3.7e10 (meaning 3.7 × 10¹⁰), 1.5e-3 (meaning 0.0015), and so on. This is particularly convenient for handling very large or very small radioactivity values.
A radioactivity converter is an online tool for converting between radioactivity units. It helps users quickly convert between common units such as Becquerel (Bq), Curie (Ci), and Millicurie (mCi), serving fields like nuclear medicine, radiation protection, environmental monitoring, and research — with no software installation required.
11 common radioactivity units are supported. These include Becquerel (Bq), Kilobecquerel (kBq), Megabecquerel (MBq), Gigabecquerel (GBq), Terabecquerel (TBq), Curie (Ci), Millicurie (mCi), Microcurie (μCi), Nanocurie (nCi), Disintegrations Per Minute (dpm), and Rutherford (Rd), covering both the SI and traditional unit systems.
Conversion is instant. All calculations run locally in your browser, so after entering a value and clicking convert, results for all 11 units appear immediately with no waiting — ideal for scenarios that require frequent conversion.
Yes, fully mobile-friendly. This tool works in browsers on computers, phones, and tablets with a responsive layout that adapts to different screen sizes, so you can convert radioactivity units anywhere, anytime.
It is faster, more comprehensive, and more convenient than traditional conversion tables. No manual table lookup is needed — enter a value to instantly see all 11 unit conversions at once, with results auto-formatted and one-click copy, eliminating the issues of outdated or hard-to-carry paper tables.
Results are accurate and reliable. Strict mathematical conversion relationships are used between units (such as the exact 1 Ci = 3.7 × 10¹⁰ Bq), with decimal parts kept to up to 6 significant places — more than sufficient for the vast majority of applications in nuclear medicine and radiation protection.
Content last updated：2026-08-06
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