Convert becquerel, curie, rutherford, and disintegrations per second for radiation measurements.
These four units all measure the same quantity: radioactive activity, the rate at which atoms in a sample disintegrate. You enter a value with its unit and the tool returns the equivalent in every other unit. The conversions are fixed definitions, not measurements - a curie is exactly 3.7 x 10^10 becquerels and a rutherford exactly 10^6 becquerels - so the arithmetic is exact. Two things surprise people: becquerel and disintegration per second are the same unit under different names, and the curie is so large that real-world values are almost always written in millicuries, microcuries, or nanocuries, not whole curies.
A concrete input and expected output from the current implementation.
Input
37 MBq
Expected output
1 mCi (0.001 Ci), 1000 uCi, 37,000,000 Bq, 37 Rd, 37,000,000 dps
One curie is exactly 3.7 x 10^10 Bq, so 37 MBq is 0.001 Ci, or 1 mCi, which is 1000 uCi. It is 37 rutherfords because a rutherford is exactly 10^6 Bq, and the becquerel and dps figures match because one becquerel is one disintegration per second by definition.
The curie is defined as exactly 3.7 x 10^10 becquerels, the rutherford as exactly 10^6 becquerels, and one becquerel is one disintegration per second by definition. Each conversion is a single multiplication or division by one of these fixed factors, so the result is exact - nothing in the conversion introduces measurement uncertainty, and converting any unit to another and back returns the original value.
Activity values span many orders of magnitude, so the tool works with prefixes: kilobecquerel (10^3 Bq), megabecquerel (10^6 Bq), gigabecquerel (10^9 Bq), and on the curie side millicurie, microcurie, and nanocurie. The familiar ratio 37 keeps appearing because one curie is 3.7 x 10^10 Bq: one microcurie is exactly 37,000 Bq and one nanocurie is exactly 37 Bq.
Exactly 3.7 x 10^10. Because that figure is so large, values expressed in whole curies are rare in practice: one millicurie is 37 MBq, one microcurie is 37 kBq, and one nanocurie is 37 Bq. If a document quotes an activity in curies at all, a prefix is almost always intended.
Yes, by definition: one becquerel is one disintegration per second, so this tool always returns the same number for both. The two names exist because the 15th General Conference on Weights and Measures adopted becquerel as the SI special name for the unit in 1975, while older documents still say disintegrations per second, or dps.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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