# Radioactivity Converter (Bq / Ci / dpm) Convert radioactivity (radionuclide activity) between becquerel (Bq, SI base = 1 decay/s), kilo/mega/gigabecquerel, curie (Ci = 3.7×10^10 Bq, exact 1950 ICRU definition, originally the activity of 1 g of radium-226), milli/microcurie, and disintegrations per minute (dpm = 1/60 Bq, exact). Converts via becquerel to the target unit and lists the equivalent value in all eight units. Reference: banana (K-40) ≈ 15 Bq, smoke detector (Am-241) ≈ 37 kBq = 1 µCi. > Canonical page: https://elysiatools.com/en/tools/radioactivity-converter - **Category:** Math & Numbers - **Keywords:** radioactivity, activity, radionuclide, becquerel, Bq, curie, Ci, mCi, µCi, disintegrations per minute, dpm, radiation, nuclear, decay rate, kBq, MBq, GBq ## Overview Convert radionuclide activity between Bq, kBq, MBq, GBq, Ci, mCi, µCi, and dpm. Enter a non-negative value, choose the input and output units, and view the converted result alongside equivalent values in all eight units. ## Inputs - **Input unit** (select) - **Value** (number): Activity in the selected Input unit. Must be non-negative. - **Output unit** (select) - **Decimal Places** (number) ## When to use - Convert curies to becquerels for SI-based calculations and reporting. - Translate small activity values between µCi, kBq, and dpm. - Check equivalent radioactivity values across common nuclear and radiation units. ## How it works - Enter a non-negative activity value. - Select the unit of the entered value, such as Bq, Ci, µCi, or dpm. - Choose the output unit and set the number of decimal places from 0 to 12. - The converter calculates through becquerels and returns the target value plus equivalents in all eight supported units. ## Use cases - Convert laboratory or reference activity values between SI and curie-based units. - Interpret small source activities, such as approximately 1 µCi or 37 kBq. - Prepare clear activity values for technical notes, calculations, and educational examples. ## Frequently asked questions ### Which radioactivity units does this converter support? It supports Bq, kBq, MBq, GBq, Ci, mCi, µCi, and dpm. ### What is the relationship between curies and becquerels? One curie equals exactly 3.7×10^10 Bq, or 37 GBq. ### How are dpm and Bq related? One Bq equals 60 disintegrations per minute, so 1 dpm equals 1/60 Bq. ### Can I convert microcuries to kilobecquerels? Yes. For example, 1 µCi equals 37 kBq. ### How many decimal places can I display? You can choose from 0 to 12 decimal places, with 6 as the default. ## Related tools - [Absolute Value Calculator](https://elysiatools.com/en/tools/absolute-value-calculator): Calculate the absolute value of positive, negative, or decimal numbers and explain the sign relationship - [Air Changes per Hour (ACH, n = Q/V)](https://elysiatools.com/en/tools/air-changes-per-hour): Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). 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