Radioactivity Decay Calculators

Assay, residual and injection times

Choose isotope or enter half-life
F-18 N-13 C-11 O-15 Rb-82 Cu-64 Tc-99m Y-90 Tl-201 Ge-68 Ga-68 Na-22 Co-57 (min)
Assay time & Assay dose
MBq kBq Bq Ci mCi μCi nCi
Residual time & Residual dose
MBq kBq Bq Ci mCi μCi nCi
Injection time & Injected dose
MBq kBq Bq Ci mCi μCi nCi

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Current activity

Given time and initial activity, displays activity at current day and time

MBq kBq Bq mCi μCi nCi F-18 N-13 C-11 O-15 Rb-82 Cu-64 Tc-99m Y-90 Tl-201 Ge-68 Ga-68 Na-22 Co-57

MBq kBq Bq mCi μCi nCi

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Decay after time

Starting from an initial activity, calculate the remaining radioactivity after a chosen delay (to find the activity at an earlier time, just use negative delay).

Isotope or half-life
F-18 N-13 C-11 O-15 Rb-82 Cu-64 Tc-99m Y-90 Tl-201 Ge-68 Ga-68 Na-22 Co-57 OR (min)

Activity
MBq kBq Bq Ci mCi μCi nCi
Time difference
hrs min sec

Decay
MBq kBq Bq Ci mCi μCi nCi

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Equivalent Frame Time

Calculate frame time needed for a count equivalent scan delayed with respect to an original scan

Isotope or half-life (min)
F-18 N-13 C-11 O-15 Rb-82 Cu-64 Tc-99m Y-90 Tl-201 Ge-68 Ga-68 Na-22 Co-57 OR
Original scan time

Scan duration
hrs min sec
Second scan time

Count eq scan time: (min)
Count eq scan time: (s)