typo

gamma-detector.ipynb

@@ -40,7 +40,7 @@
     "In front of this gamma detector, we will place two point sources:\n",
     "* The first source will launch $10^{12}$ gamma particles with an energy of 200 keV per second toward the detector. \n",
     "* The second source simulates the emissions of 1 gram of Cs137.\n",
-    "Cs137 is a radioactive isotope that primarily emits gamma particles with an energy of 661.7 keV due to beta decay into Ba-137m.\n",
+    "Cs137 is a radioactive isotope that primarily emits gamma particles with an energy of 661.7 keV due to beta decay into Ba137_m1.\n",
     "The Ba137_m1 releases gamma radiation to de-excite. In addition, this source is implemented as an isotropic source.\n",
     "\n",
     "To obtain the emissions from an arbitrary isotopic source, OpenMC provides the `openmc.data.decay_photon_energy` feature, which returns the gamma radiation emitted during radioactive decay.\n",