A radiation generating apparatus (1A, 1B, 1C) comprising: a fuel storage unit storing a mixed liquid having a liquefied gas mixed in a suspension containing a liquid and a plurality of fuel particles dispersed in the liquid; a pressure application unit for applying a pressure to the mixed liquid stored in the fuel storage unit; a jet formation unit for jetting the pressurized mixed liquid out of a small hole so as to form a jet (61a, 61b) of the mixed liquid; a reaction unit for forming the jet (61a, 61b) therein; a pressure adjustment unit for setting a pressure in the reaction unit lower than an internal pressure of the jet formation unit; and a light source unit for irradiating a particle group constituted by the plurality of fuel particles with laser light; and a control unit for controlling the radiation generationg apparatus (1A, 1B, 1C) wherein the fuel particle generate a desirable radiation when irradiated with the laser light; wherein a fluorocarbon or hydrocarbon based gas is used for the liquefied gas; and wherein the control unit is configured to send a control signal to the jet formation unit so as to cause the mixed liquid to be jetted from the jet formation unit to the reaction unit, resulting in movement of the plurality of fuel particles along a direction of the jet (61a, 61b) and the liquefied gas in the jet (61a, 61b) vaporizing in the said lower pressure of the reaction unit, so as to expand, thereby dissipating the liquid from the suspension, while the liquefied gas and the liquid move away from the plurality of fuel particles, and are eliminated from the jet (61a, 61b) of the suspension so as to form the particle group. a fuel storage unit storing a mixed liquid having a liquefied gas mixed in a suspension containing a liquid and a plurality of fuel particles dispersed in the liquid; a pressure application unit for applying a pressure to the mixed liquid stored in the fuel storage unit; a jet formation unit for jetting the pressurized mixed liquid out of a small hole so as to form a jet (61a, 61b) of the mixed liquid; a reaction unit for forming the jet (61a, 61b) therein; a pressure adjustment unit for setting a pressure in the reaction unit lower than an internal pressure of the jet formation unit; and a light source unit for irradiating a particle group constituted by the plurality of fuel particles with laser light; and a control unit for controlling the radiation generationg apparatus (1A, 1B, 1C) wherein the fuel particle generate a desirable radiation when irradiated with the laser light; wherein a fluorocarbon or hydrocarbon based gas is used for the liquefied gas; and wherein the control unit is configured to send a control signal to the jet formation unit so as to cause the mixed liquid to be jetted from the jet formation unit to the reaction unit, resulting in movement of the plurality of fuel particles along a direction of the jet (61a, 61b) and the liquefied gas in the jet (61a, 61b) vaporizing in the said lower pressure of the reaction unit, so as to expand, thereby dissipating the liquid from the suspension, while the liquefied gas and the liquid move away from the plurality of fuel particles, and are eliminated from the jet (61a, 61b) of the suspension so as to form the particle group.