Kernforschungszentrum Karlsruhe Gmbh

Toshiba Glass Co., Ltd.

Kernforschungszentrum Karlsruhe Gesellschaft MIT Beschrankter Haftung

Bertram Burgkhardt

Ernst Piesch

Motoyuki Sato

Toru Ikegami

Yasushi Mawatari

Hans-Gerd Rober

Hans G Rober

Winfried Konig

Siegfried Ugi

Koichi Nishio

Tatsuyo Ishidoya

Junji Yamada

Michael Vilgis

A method and apparatus for reading a glass dosimeter in which a fluorescent glass element after exposure to ionizing radiation is subjected to ultraviolet light pulses so as to generate fluorescence pulses which are sampled in different sampling periods for determination of the exposure dose of the glass element by utilizing a fluorescent pulse component in a particular wavelength range. Preferably, concurrently an unexposed sample glass is subjected to the same UV light pulses and its fluorescence is subtracted from the exposure dose value in order in eliminate the base dose inherent to a particular glass for improved accuracy.

Gas dosimeter reading method and apparatus

In a radiation dose reading apparatus for a fluorescent glass element which was exposed to ionizing radiation and which is subjected to ultraviolet light radiation so as to cause fluorescence with an intensity depending on the radiation dose received by the glass element wherein the radiation dose is determined from the intensity of the fluorescence emitted from the glass elements detecting face, a fluorescence diaphragm arrangement is provided so as to overlay the glass element detecting face and is movable thereon for changing the fluorescence detecting areas and a fluorescence intensity reading device is provided for determining fluorescence intensity distribution and the glass element detecting face.

Radiation dose reading apparatus

A fluorescent glass dosimeter comprises a glass element holder including inner and outer envelopes. Each of the inner and outer envelopes has a mask frame used for covering the peripheral portions of the corresponding fluorescent detection surface of a fluorescent glass element. The fluorescent glass dosimeter further comprises upper and lower cases. The upper case serves as a pivotable lock member and includes a lock portion, the locking condition of which can be released by means of a magnet. The lower case is adapted to receive the glass element holder. The upper and lower cases are engageable with each other at their slide portions. The glass element holder includes an integral index plate havig an identification hole code at a predetermined location. A direction regulating member is provided for the lower case, and a portion engageable with the direction regulating member is provided for the glass element holder. The fluorescent glass holder is positioned as a result of the engagement between the direction regulating member and the engageable portion of the glass element holder. A filter, used for adjusting energy dependency upon a radiation exposure, is located on the inner side of the upper wall of each of the upper and lower cases. A filter, used for adjusting direction dependency upon an incident radiation, is located on the inner side of the side wall of the lower case.

Fluorescent glass dosimeter

A radiation dose measuring system using fluorescent dosemeters comprises fluorescent dosemeters including fluorescent glass elements having a fluorescent detection surface, a magazine capable of holding a predetermined number of fluorescent dosemeters, a magazine conveying device for conveying a magazine of a plurality of magazines fed one by one such that is predetermined segment is located to a take-out position, a fluorescent dosemeter take-out device for taking the fluorescent dosemeter from the magazine located in a predetermined position, a fluorescent glass element setting device for moving the fluorescent glass element to a predetermined measuring position and a dose measuring device for subjecting the fluorescent glass element which is set to a measuring position to an ultraviolet ray and for measuring an intensity of fluorescent light which is emitted from an excited glass element.

System for measuring radiation doses using fluorescent dosemeters

An apparatus for measuring dose equivalent, absorbed dose and neutron fluence in stray radiation fields of neutron source. The apparatus includes a moderator sphere having an outer surface and a neutron detector disposed in the center of the moderator sphere for producing a counting rate representing a measure of thermal neutrons in the center of the sphere. In addition, at least one detector combination is disposed at the outer surface of the moderator sphere. The detector combination includes a plurality of neutron detectors and a shield for providing each respective detector in the plurality of detectors with a different shielding absorption of thermal neutrons. The detectors of the detector combination produce count rates which can be used to separately measure albedo neutrons back-scattered by the moderator sphere and incident thermal neutrons from the stray radiation field.

Apparatus for measuring dose energy in stray radiation fields

A device for evaluating the exposure of a phosphate glass dosimeter to ioing radiation by effecting differential scanning of the dosimeter glass with light radiation, including a member for holding the glass stationary, a device for supplying a single beam of light for effecting the evaluation; and a scanning system composed of an element defining a pivotal, elongated slit, two rotatable mirrors and two stationary mirrors arranged in the path of the single beam and operable for causing the beam to scan the glass selectively along any one of three coordinates.

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Karlsruhe, Germany

Bertram Burgkhardt