diff --git a/definitions/grib2/template.4.124.def b/definitions/grib2/template.4.124.def
new file mode 100644
index 000000000..a3b83980e
--- /dev/null
+++ b/definitions/grib2/template.4.124.def
@@ -0,0 +1,12 @@
+# (C) Copyright 2005- ECMWF.
+
+# TEMPLATE 4.124, Analysis or forecast at a horizontal level or in a horizontal layer at a point in time for radionuclides
+
+include "grib2/template.4.parameter.def"
+include "grib2/template.4.chemical.def"
+include "grib2/template.4.source.def"
+include "grib2/template.4.radionuclides.def"
+include "grib2/template.4.generating_process.def"
+include "grib2/template.4.forecast_time.def"
+include "grib2/template.4.point_in_time.def"
+include "grib2/template.4.horizontal.def"
diff --git a/definitions/grib2/template.4.125.def b/definitions/grib2/template.4.125.def
new file mode 100644
index 000000000..88ebd7894
--- /dev/null
+++ b/definitions/grib2/template.4.125.def
@@ -0,0 +1,13 @@
+# (C) Copyright 2005- ECMWF.
+
+# TEMPLATE 4.125, Individual ensemble forecast, control and perturbed, at a horizontal level or in a horizontal layer at a point in time for radionuclides
+
+include "grib2/template.4.parameter.def"
+include "grib2/template.4.chemical.def"
+include "grib2/template.4.source.def"
+include "grib2/template.4.radionuclides.def"
+include "grib2/template.4.generating_process.def"
+include "grib2/template.4.forecast_time.def"
+include "grib2/template.4.point_in_time.def"
+include "grib2/template.4.horizontal.def"
+include "grib2/template.4.eps.def"
diff --git a/definitions/grib2/template.4.126.def b/definitions/grib2/template.4.126.def
new file mode 100644
index 000000000..fed3fbac1
--- /dev/null
+++ b/definitions/grib2/template.4.126.def
@@ -0,0 +1,12 @@
+# (C) Copyright 2005- ECMWF.
+
+# TEMPLATE 4.126, Average, accumulation, and/or extreme values or other statistically processed values at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval for radionuclides
+
+include "grib2/template.4.parameter.def"
+include "grib2/template.4.chemical.def"
+include "grib2/template.4.source.def"
+include "grib2/template.4.radionuclides.def"
+include "grib2/template.4.generating_process.def"
+include "grib2/template.4.forecast_time.def"
+include "grib2/template.4.horizontal.def"
+include "grib2/template.4.statistical.def"
diff --git a/definitions/grib2/template.4.127.def b/definitions/grib2/template.4.127.def
new file mode 100644
index 000000000..baa754fca
--- /dev/null
+++ b/definitions/grib2/template.4.127.def
@@ -0,0 +1,14 @@
+# (C) Copyright 2005- ECMWF.
+
+# TEMPLATE 4.127, Individual ensemble forecast, control and perturbed, at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval for radionuclides
+
+include "grib2/template.4.parameter.def"
+include "grib2/template.4.chemical.def"
+include "grib2/template.4.source.def"
+include "grib2/template.4.radionuclides.def"
+include "grib2/template.4.generating_process.def"
+include "grib2/template.4.forecast_time.def"
+include "grib2/template.4.horizontal.def"
+include "grib2/template.4.eps.def"
+include "grib2/template.4.statistical.def"
+
diff --git a/definitions/grib2/template.4.radionuclides.def b/definitions/grib2/template.4.radionuclides.def
new file mode 100644
index 000000000..0e55346ab
--- /dev/null
+++ b/definitions/grib2/template.4.radionuclides.def
@@ -0,0 +1,31 @@
+codetable[2] transportModelUsed ('4.333.table',masterDir,localDir) : edition_specific;
+
+codetable[2] requestedByEntity 'common/c-11.table' : dump,string_type;
+
+codetable[2] scenarioOrigin ('4.335.table',masterDir,localDir) : edition_specific;
+
+codetable[2] NWPused ('4.336.table',masterDir,localDir) : edition_specific;
+
+unsigned[2] releaseStartYear : edition_specific;
+
+unsigned[1] releaseStartMonth : edition_specific;
+
+unsigned[1] releaseStartDay : edition_specific;
+
+unsigned[1] releaseStartHour : edition_specific;
+
+unsigned[1] releaseStartMinute : edition_specific;
+
+unsigned[1] releaseStartSecond : edition_specific;
+
+unsigned[2] WallClockInitialTimeOfExecutionYear : edition_specific;
+
+unsigned[1] WallClockInitialTimeOfExecutionMonth : edition_specific;
+
+unsigned[1] WallClockInitialTimeOfExecutionDay : edition_specific;
+
+unsigned[1] WallClockInitialTimeOfExecutionHour : edition_specific;
+
+unsigned[1] WallClockInitialTimeOfExecutionMinute : edition_specific;
+
+unsigned[1] WallClockInitialTimeOfExecutionSecond : edition_specific;