Activity to Moles (AtoN_TP)
Author: J. Anthony Parker, MD PhD (
Dates: 2003/10/3: First version
2004/4/14: <alt> option to calculate activity from cps and efficiency
2005/10/12: <shift> option to enter specific activity
Source: The source file,
Installation: Download AtoN_TP.class to the plugins folder and restart ImageJ.  AtoN_TP is also included in see NucMed.
Description: This ImageJ PlugIn calculates the number of atoms, N, the weight, the moles, and the molarity of a radioisotope given the activity, A, the half-life, and the atomic weight.  Please let me know if there are any errors in the calculation.

An optional version of this plugin can be loaded by holding down the <alt> key while the plugin loads.  The activity is calculated from counts per second, cps, and detector efficiency.  The idea is that you measure the activity with a detector.  The detector records a certain cps.  The efficiency is equal to cps/dps, where dps is disintegrations per second (aka Bequerels).

A second option can be loaded by holding down the <shift> key while the plugin loads.  Instead of entering the fraction of radioactive atoms, N*/N, the specific activity can be entered.  Both <alt> and <shift> can be used simultaneously.
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