Magakian et al. (2019) called attention to the current bright state of LkHa 225 South, which over past two decades has changed from $>20^m$ $<13^m$. We present recent optical photometric monitoring that shows colorless, non-sinusoidal, periodic brightness variations. The oscillations occur every 43 days, and have amplitude $\sim$0.7 mag with some variation among cycles. also new flux-calibrated...

There has been growing clinical evidence of the value targeted alpha therapy for treatment several cancers. The work slowed by lack availability key emitting isotopes, especially Ac-225. It can be produced photonuclear reaction, Ra-226(?,n)Ra-225. Ra-225 decays via beta-decay to Ac-225 with a half-life 14.9 days. This paper will provide technical description radium targets and target chamber th...