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Radioactivity Converter processes your data locally in your browser. Nothing is sent to or stored on our servers.

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Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Radioactivity Converter

Convert radioactivity between becquerel, curie, rutherford, and other radioactivity units.

Convert Units

From:

To:

Result:

Convert radioactivity measurements between different units including becquerel, curie, rutherford, and more with our professional radioactivity converter.

What is Radioactivity Converter?

Radioactivity is the spontaneous emission of radiation from atomic nuclei.

Understanding the Units

Becquerel (Bq)

SI unit of radioactivity. One decay per second.

Common Uses: Scientific measurements

Curie (Ci)

Older unit of radioactivity.

Common Uses: Medical, historical

Conversion: 1 Ci = 37 billion Bq

Common Conversions

Banana: ~15 Bq (natural potassium-40 radioactivity)
Medical tracer (PET scan): 1 mCi = 37 MBq
Smoke detector source: ~37,000 Bq of Americium-241
Background radiation in soil: ~3,700 Bq/kg = 0.1 µCi/kg

Conversion Formulas

Activity = Number of atoms × Decay constant (A = N × λ)
Half-life formula: N(t) = N₀ × (1/2)^(t/t½)
Curie to Becquerel: Bq = Ci × 37,000,000,000
Becquerel to Curie: Ci = Bq ÷ 37,000,000,000
Millisecond to Megabecquerel: 1 mCi = 37 MBq

Practical Examples

Body naturally contains ~4,000 Bq from potassium-40 and carbon-14

Chest X-ray: ~0.1 mSv effective dose (dose, not activity)

Nuclear power plant: reactor operates at billions of GBq activity level

Radon in homes: recommended action level ~200 Bq/m³ (EU) or 148 Bq/m³ (US)

When to Use Each Unit

Becquerel (Bq): Modern scientific, medical, and regulatory measurements (SI unit)

Curie (Ci): Older US medical references, historical nuclear data

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