Provided are a mineralizing removal method and apparatus for highly concentrated iodine in radioactive wastewater. Similarly, a plurality of slots, which incline in directions that focus toward the radiation source, are formed in support members constructed of a radiation-absorbing substance. The fluid preferably is dispensed for use after dispensing in some other purpose than as a source for electrochemical energy to dispense fluid from the reservoir. A membrane is secured on the base surface of the upper cap of the cartridge, the membrane having the role of a one-way valve.