A stable, process independent RC time constant for precision frequency response in automatic tuning is generated using a feedback loop employing a voltage controlled resistor to force current through the output node to equal a reference current. The ISPOSP maintains multiple instances of the resource. An s-shaped valve 600 includes a path 605 for coupling the fluid from outlet 118 of the hand piece 101 to the aperture 118 of the cover. A preparation method of the stimulable phosphor and a radiation image conversion panel using the stimulable phosphor are also disclosed. The fixing portion includes a pair of locking legs and four stop latches.