Radioactivity
µCitodpm
Convert microcuries (µCi) to disintegrations per minute (dpm).
Factor1 µCi = 2220000 dpm
Converter
µCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
dpm
Rendered to 6 significant figures.
Formula
Formula
dpm = µCi × 2220000
Multiply any value in microcuries by 2220000 to obtain the value in disintegrations per minute.
Worked example
Convert 1 µCi to dpm.
- 01Start with 1 µCi.
- 02Multiply by the conversion factor: 1 × 2220000 = 2.22000e+6 dpm.
Result1 µCi = 2.22000e+6 dpm
Conversion table
| µCi | dpm |
|---|---|
| 1 | 2.2200e+6 |
| 2 | 4.4400e+6 |
| 5 | 1.11e+7 |
| 10 | 2.22e+7 |
| 20 | 4.44e+7 |
| 50 | 1.11e+8 |
| 100 | 2.22e+8 |
| 200 | 4.44e+8 |
| 500 | 1.11e+9 |
| 1000 | 2.22e+9 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from µCi to dpm?
1 µCi equals 2220000 dpm. To convert, multiply the value in microcuries by 2220000.
How do I convert 1 µCi to dpm?
1 µCi = 2.22000e+6 dpm. For any value, multiply by 2220000.
How do I convert dpm back to µCi?
Divide by the same factor — or equivalently, multiply by 4.504505e-7. So 1 dpm = 4.5045e-7 µCi.
When would I need to convert microcurie to disintegration per minute?
Radioactivity (activity) conversions between µCi and dpm 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).