A radiation source module for use in a fluid treatment system. The
radiation source module comprises: a frame (205) having a first support
member, at least one radiation source assembly (125) extending from and in
engagement with a first support member, the at least one radiation source
assembly comprising at least one radiation source disposed within a
protective sleeve; and an optical radiation sensor (150) disposed within
the protective sleeve. The radiation source module is particularly useful
in ultraviolet radiation treatment systems used to disinfect wastewater.
