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Math & Numbers

Radioactivity Converter (Bq / Ci / dpm)

· Last updated：2026-08-02

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.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

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.

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

  1. 1Enter a non-negative activity value.
  2. 2Select the unit of the entered value, such as Bq, Ci, µCi, or dpm.
  3. 3Choose the output unit and set the number of decimal places from 0 to 12.
  4. 4The 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.

Examples

1. Convert curies to gigabecquerels

Radiation science student

Background

A reference value is provided in curies, but the calculation requires an SI-based activity unit.

Problem

Find the equivalent of 1 Ci in GBq and review the other unit equivalents.

How to use

Enter 1 as the value, select Ci as the input unit, choose GBq as the output unit, and keep the decimal setting at 6.

{"inputUnit":"Ci","value":1,"outputUnit":"GBq","decimalPlaces":6}

Outcome

The result is 37 GBq. The tool also lists 3.7×10^10 Bq, 1,000 mCi, 1,000,000 µCi, and 2.22×10^12 dpm.

2. Convert a smoke detector activity

Safety educator

Background

A household ionization smoke detector reference uses approximately 1 µCi of Am-241 activity.

Problem

Express the activity in kilobecquerels and dpm for an educational comparison.

How to use

Enter 1 as the value, select µCi as the input unit, choose kBq as the output unit, and set the desired decimal places.

FAQ

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.

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{"inputUnit":"µCi","value":1,"outputUnit":"kBq","decimalPlaces":6}

Outcome

The result is 37 kBq, equivalent to 37,000 Bq and 2,220,000 dpm.