Monona-based Phoenix Nuclear Holding Co. is working to raise $15 million in equity funding, according to a new filing with the SEC.

Isolated radioactive material

The round was launched Dec. 31, and so far $4.5 million has been raised from three investors, according to the filing. The capital would be used for general corporate purposes.

Phoenix designs and manufactures neutron generators with the aim of commercializing nuclear technologies for practical applications in the medical, defense and energy sectors. Among its customers is Janesville-based spinoff company Shine Medical Technologies, which produces isotopes used in medical imaging. Read the full story here.