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Radioactivity

dpmtonCi

Convert disintegrations per minute (dpm) to nanocuries (nCi).

Factor1 dpm = 0.0004504505 nCi

Converter

dpm

Accepts numbers or expressions, e.g. 150 + 14.7

Result
4.5045nCi

Rendered to 6 significant figures.

Formula

Formula
nCi = dpm × 0.0004504505

Multiply any value in disintegrations per minute by 0.0004504505 to obtain the value in nanocuries.

Worked example

Convert 10000 dpm to nCi.

  1. 01Start with 10000 dpm.
  2. 02Multiply by the conversion factor: 10000 × 0.0004504505 = 4.5045 nCi.
Result10000 dpm = 4.5045 nCi

Conversion table

dpmnCi
10.00045045
20.0009009
50.0022523
100.0045045
200.009009
500.022523
1000.045045
2000.09009
5000.22523
10000.45045

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from dpm to nCi?
1 dpm equals 0.0004504505 nCi. To convert, multiply the value in disintegrations per minute by 0.0004504505.
How do I convert 1 dpm to nCi?
1 dpm = 0.00045045 nCi. For any value, multiply by 0.0004504505.
How do I convert nCi back to dpm?
Divide by the same factor — or equivalently, multiply by 2220. So 1 nCi = 2220 dpm.
When would I need to convert disintegration per minute to nanocurie?
Radioactivity (activity) conversions between dpm and nCi are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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