Claims
- 1. A method of measuring the dose of incident radiation by detecting stimulated fluorescence and prompt fluorescence at specified time intervals using a fluorescence detecting mechanism on the basis of two actions of a stimulable phosphor as a radiation detecting medium, one being the ability to accumulate an incident radiation and output the quantity of accumulated radiation as stimulated fluorescence and the other being the ability to emit prompt fluorescence upon excitation by an incident radiation. wherein if the fluorescence detecting mechanism is saturated to failure by the incidence of an intense radiation within a short period of time during detection of stimulated fluorescence and prompt fluorescence with the fluorescence detecting mechanism at specified time intervals, stimulated fluorescence is read after the recovery of the fluorescence detecting mechanism so as to measure the incident dose of intense radiation.
- 2. In a method for measuring the dose of incident radiation by detecting stimulated fluorescence and prompt fluorescence at specified time intervals using apparatus comprising a fluorescence detecting mechanism on the basis of two actions of a stimulable phosphor as a radiation detecting medium, one being the ability to accumulate an incident radiation and output the quantity of accumulated radiation as stimulated fluorescence and the other being the ability to emit prompt fluorescence upon excitation by an incident radiation, wherein if the fluorescence detecting mechanism is saturated to failure by the incidence of an intense radiation within a short period of time during detection of stimulated fluorescence and prompt fluorescence, stimulated fluorescence is read after the recovery of the fluorescence detecting mechanism so as to measure the incident dose of intense radiation, the improvement wherein the fluorescence detecting mechanism is monitored for saturation on a time-division multiplexing basis and the dose of radiation accumulated in the stimulable phosphor is measured with the quantity of exciting light on the stimulable phosphor being altered in such a way as to ensure that the fluorescence detecting mechanism is not saturated to failure when reading the rapid intense dose of incident radiation after recovery from the saturated state.
- 3. In a method for measuring the dose of incident radiation by detecting stimulated fluorescence and prompt fluorescence at specified time intervals using an apparatus comprising a fluorescence detecting mechanism on the basis of two actions of a stimulable phosphor as a radiation detecting medium, one being the ability to accumulate an incident radiation and output the quantity of accumulated radiation as stimulated fluorescence and the other being the ability to emit prompt fluorescence upon excitation by an incident radiation, wherein if the fluorescence detecting mechanism is saturated to failure by the incidence of an intense radiation within a short period of time during detection of stimulated fluorescence and prompt fluorescence, stimulated fluorescence is read after the recovery of the fluorescence detecting mechanism so as to measure the incident dose of intense radiation, the improvement wherein the fluorescence detecting mechanism is monitored for saturation on a time-division multiplexing basis and the dose of radiation accumulated in the stimulable phosphor is measured with the sensitivity for fluorescence detection by the fluorescence detecting mechanism being altered in such a way as to ensure that the fluorescence detecting mechanism is not saturated to failure when reading the rapid intense dose of incident radiation after recovery from the saturated state.
- 4. The method of claim 3, wherein the fluorescence detecting mechanism is monitored for saturation on a time-division multiplexing basis and the dose of radiation accumulated in the stimulable phosphor is measured with both the quantity of exiting light on the stimulable phosphor and the sensitivity for fluorescence detection by the fluorescence detecting mechanism being altered in such a way as to ensure that the fluorescence detecting mechanism is not saturated to failure when reading the rapid intense dose of incident radiation after recovery from the saturated state.
- 5. In a method for measuring the dose of incident radiation by detecting stimulated fluorescence and prompt fluorescence at specified time intervals using an apparatus comprising a fluorescence detecting mechanism on the basis of two actions of a stimulable phosphor as a radiation detecting medium, one being the ability to accumulate an incident radiation and output the quantity of accumulated radiation as stimulated fluorescence and the other being the ability to emit prompt fluorescence upon excitation by an incident radiation, wherein the fluorescence detecting mechanism is monitored for saturation on a time-division multiplexing basis and if it is saturated to failure by the incidence of an intense radiation within a short period of time during detection of stimulated fluorescence and prompt fluorescence, stimulated fluorescence is read after the recovery of the fluorescence detecting mechanism so as to measure the incident dose of intense radiation, the improvement wherein the contribution from measurement of prompt fluorescence due to incidental illumination of the stimulable phosphor with radiation is corrected on the basis of the dose of radiation measured at specified time intervals by counting the photons in prompt fluorescence using the fluorescence detecting mechanism.
- 6. The method of any one of claims 2, 3, 4, or 5, wherein the a dose or radiation accumulated in the stimulable phosphor is measured.
Priority Claims (2)
Number |
Date |
Country |
Kind |
11-50301 |
Feb 1999 |
JP |
|
11-55897 |
Mar 1999 |
JP |
|
Parent Case Info
This application claims the benefit under 35 U.S.C. §120 and 119(a) of prior filed U.S application 09/511,913 filed Feb. 23, 2000, which claims priority to Japanese Patent Application No. 50301/1999 filed in Japan on Feb. 26, 1999 and Japanese Patent Application No. 55897/1999 filed in Japan on Mar. 3, 1999.
US Referenced Citations (13)
Foreign Referenced Citations (2)
Number |
Date |
Country |
58-117476 |
Jul 1983 |
JP |
58-117477 |
Jul 1983 |
JP |
Non-Patent Literature Citations (4)
Entry |
D.J. Huntley et al., Nature, vol. 313, 10, pp. 105-107. |
Kitaguchi et al., JAERI-Conf. 98-011, pp. 62-66 (Japanese language document). |
S.W.S. McKeever et al., Radiation Protection Dosimetry, vol. 65, No. ¼, pp. 2667-272. |
Maekawa et al., Hoshasen, vol. 21, No. 3, pp. 69-78 (English Language abstract only). |