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radiochemicals
 Location: Radiochemicals > Radiation Safety and Technical Support > Calculators > Decay time
Radiation Safety and Technical Support
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Safe and Secure - Working Safely with Radioactivity
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Physical Properties of Common Radionuclides
Calculators
Unit conversion
Activity decay
Chemical concentration and labelling ratio
Decay time
Percentage decay
Volume
Counts to Activity
Glossary
Calculation of Time Taken For Radioactive Material to Decay to a Selected Activity

Instructions for use:
1. Enter initial activity
2. Select appropriate units from the drop-down list
3. Enter the final (target) activity
4. Select appropriate units from the drop-down list
5. Either a) select an isotope from the drop-down list
   (in which case the half-life, in days, will fill automatically)
   or b) enter the half-life of your isotope and select appropriate units
6. Click 'Calculate'
7. Click 'Reset' before entering any new values

* = compulsory fields

enter valuesenter units

* Initial activity

*
* Final activity *
* Half-life *

It will take   to decay from to