Mother Curie III

 is the leader of a small cult living in the Holy Light Monastery in Springvale in 2277. She is added to Fallout 3 by the add-on Broken Steel

Background
Mother Curie III is a former Child of Atom and Megaton local who took Megaton's entire Aqua Pura shipment and began irradiating it and distributing it as Holy Water to fulfill her perceived religious calling to spread irradiation.

Effects of player actions
In the quest Holy Water, The Lone Wanderer has the choice of persuading Curie to stop distributing the Holy Water to others, or stopping her by killing her and her followers. She'll also give the player character some Holy Water when asked. Also if the Lone Wanderer gets a high radiation (600-800) she will think that the player is the Atom's Prophet and you will be able to tell her to stop irradiating the water.

Appearances
Mother Curie III appears in the Broken Steel add-on for Fallout 3.

Behind the scenes

 * Mother Curie III's name is a reference to Marie Curie, an early pioneer of the study of radiation, who died of radiation poisoning.