pattern - What is an Energetic Transmitter Word™?

_{This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

If a word conforms to a special rule, I call it an Energetic Transmitter Word™.

Use the following examples below to find the rule.

And, if you want to analyze, here is a CSV version:

Energetic Transmitter Words™,Not Energetic Transmitter Words™
AUDIOGRAM,INAUDIBLE
BUCKMINSTERFULLERENE,BUCKY-BALL
COMMUNICABLE,TRANSLATABLE
COMPULSION,OBSESSION
DRAGON,MONSTER
DUMBFOUNDING,BAMBOOZLING

ENTHUSIASM,EAGERNESS
HOMEBUILDER,HOMEMAKER
IMMUNOFLUORESCENCE,EPIFLUORESCENCE 
MICROFAUNA,MACROFAUNA
MOUNTAINEERING,SPELUNKING
TANTALIZES,EXCITES
UNIMAGINATIVENESS,TEDIOUSNESS
IMMUNOTHERAPEUTIC,MICROTRANSPLANTATION

Answer

I think an ETW is one that

contains the letters of a radioactive element (i.e., one with no stable isotope).

Specifics, which also explain why IMMUNOTHERAPEUTIC is extremely energetic:

AUDIOGRAM: RADIUM
BUCKMINSTERFULLERENE: BERKELIUM
COMMUNICABLE: NOBELIUM
COMPULSION: POLONIUM
DRAGON: RADON

DUMBFOUNDING: DUBNIUM
ENTHUSIASM: HASSIUM
HOMEBUILDER: BOHRIUM
IMMUNOFLUORESCENCE: FERMIUM
MICROFAUNA: FRANCIUM
MOUNTAINEERING: ROENTGENIUM
TANTALIZES: ASTATINE
UNIMAGINATIVENESS: EINSTEINIUM
IMMUNOTHERAPEUTIC: CURIUM
IMMUNOTHERAPEUTIC: TECHNETIUM

IMMUNOTHERAPEUTIC: ACTINIUM
(and there are, so Engineer Toast assures me and I have no trouble believing, several others that likewise go into IMMUNOTHERAPEUTIC besides those three)

I confess I haven't checked all the non-ETWs.