Patent ID: 6998624

Claim:
A method for measuring the dose of radiation accumulated in a stimulable phosphor BaFBr:Eu 2+ as a radiation detecting medium having a fluorescence lifetime of no longer than 2 μs, comprising the steps of illuminating the stimulable phosphor with pulsed exciting light having an irradiation time not longer than the lifetime of stimulated fluorescence from the stimulable phosphor, detecting the emitted fluorescence with a photodetector, amplifying the detected signal with a charge-sensitive preamplifier, feeding the amplified output signal into a pulse shaping amplifier where it is subjected to both waveform shaping with a time constant longer than the lifetime of stimulated fluorescence from the stimulable phosphor and amplification, and feeding the shaped and amplified signal into an analog/digital converter to determine the pulse height, wherein a gated photomultiplier tube is used as the photodetector and synchronously with the illumination of the stimulable phosphor with pulsed exciting light having an irradiation time not longer than the lifetime of stimulated fluorescence from the stimulable phosphor, the gate of the photomultiplier tube is controlled such that it remains off as long as the illumination continues but turns on after the illumination ends, and the emission of stimulated fluorescence from the excited stimulable phosphor is detected.