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glowing
The word radiant means glowing with heat.
radiant (adjective)
קוֹרֵן (korén) = radiant, shining, irradiant
זוֹהֵר (zohér) = radiant, lustrous, flaring, incandescent
מַקרִין (makrín) = radiant, horned, cornute
זַהֲרוּרִי (zahrurí) = glowing, radiant, reddish
resplendent is like splendid and can mean glowing/bright, but radiant means bright and shining...
Do you, perhaps, mean "radioactive"?
Yes, radioactive materials can be hazardous.
If you literally mean "radiant", i.e. glowing, that's not technically in itself a hazard.