Cs-137/Ba-137m Isotope Generator Kit

The Cs-137/Ba-137m isotope generator is based on the original Union Carbide patented design. It is designed for demonstrating the properties of radioactive decay.

The isotope generator contains 10 μCi (370 kBq) of Cs-137 (± 20%).

The isotope generator can produce up to 1000 small aliquots of the short lived isotope, Ba-137m (half-life: 2.6 minutes).

A bottle containing 250 ml of eluting solutions is supplied with each isotope generator. Additional solution may be ordered separately.

How it Works

Cs-137 is a long-lived parent nuclide which has a half-life of 30.07 years and decays by the emission of beta radiation into the stable isotope Ba-137. This transition is completed either by direct conversion into stable Ba-137 (5.4 %) or via the metastable energy state of Ba-137m (94.6 %). Ba-137m has a half-life of 2.55 minutes and decays by isomeric transition, emitting a gamma ray (Eγ = 0.6617 MeV), into the stable isotope Ba-137.

The decay scheme of Cs-137 can be seen below.

The isotope generator contains up to 10 μCi (370 kBq) of Cs-137 bound on a special ion exchange medium. Using an eluting solution (which is forced through the isotope exchange column using a syringe) the Ba-137 is selectively extracted from the ion exchange medium leaving only the Cs-137. This process is called “milking the generator.”

Download the Isotope Generator Operating Instructions.

All isotope generators have an uncertainty of ± 20%.

Not available for calibration.
Isotope generator kit components:
ISO Cs-137/Ba-137m Isotope Generator, Cs-137, 10 μCi (370 kBq)
ISO1 5 ml plastic syringe
CC1 Pack of 10 1″ aluminum planchets
ELSN Bottle of eluting solution – 250 ml
RSB01 Isotope Generator case
Ordering information:
ISO Cs-137/Ba-137m Isotope Generator Kit, Cs-137, 10 μCi (370 kBq)
Available accessories:
ELSN Bottle of eluting solution – 250 ml
CC25 Pack of 25 1″ aluminum planchets