diff --git a/src/idl/dustem_get_emission_conversion_factor.pro b/src/idl/dustem_get_emission_conversion_factor.pro
new file mode 100644
index 0000000..6bd81ef
--- /dev/null
+++ b/src/idl/dustem_get_emission_conversion_factor.pro
@@ -0,0 +1,9 @@
+FUNCTION dustem_get_emission_conversion_factor,bidon
+
+wav=dustem_get_wavelengths()
+
+;conversion factor to be multipied by to go from Fortran spectrum unit () into MJy/sr for NH=(*!dustem_HCD)
+fact = 1.e4*(*!dustem_HCD)/(4.*!pi)/(3.e8/1.e-6/wav)*1.e20/1.e7
+
+RETURN,fact
+END
\ No newline at end of file
--
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