Source Strength Unit Converter

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Result appears above this form after conversion.

Important: Converting between activity and air-kerma strength is not universal. It depends on radionuclide, encapsulation, and calibration. This tool converts within each family.

Formula Used

1) Activity conversions

Activity measures nuclear decays per unit time. The base unit is the becquerel: 1 Bq = 1 disintegration per second. Curie-based conversions use: 1 Ci = 3.7 × 10¹⁰ Bq. For minutes: 1 dpm = 1/60 Bq.

2) Air-kerma strength conversions

Air-kerma strength is commonly expressed in U, where 1 U = 1 μGy·m²/h. A frequently used equivalent form is: 1 U = 1 cGy·cm²/h. The converter uses a single base and scales via unit factors for μGy, mGy, Gy and m², cm².

How to Use This Calculator

Select a quantity family (Activity or Air-kerma strength).
Enter the value you want to convert.
Choose the From and To units.
Set decimals or enable scientific notation.
Click Convert. Your result appears above the form.
Use Download CSV or Download PDF after conversion.

Example Data Table

Quantity	Input	Converted To	Result
Activity	37 MBq	mCi	≈ 1.000000 mCi
Activity	2500 μCi	MBq	≈ 92.500000 MBq
Air-kerma strength	12 U	cGy·cm²/h	12.000000 cGy·cm²/h
Air-kerma strength	0.004 Gy·m²/h	U	≈ 4000.000000 U

Values are rounded for display. Use the calculator for exact formatting.

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