A review is given on recent progresses in dosimeter with silver-activated phosphate glass.
Trapezoidal shape of glass and its cell combined with a suitable holder greatly improves the dosimeter energy response to β-rays and to X-rays down to 20 keV. The glass dosimeter response to thermal and fast neutrons is described. Fast neutron dose can be measured from the Cerenkov radiation intensity due to
31P(n p)
31Si reaction in the glass.
An improved spherical capsule makes the glass response independent of photon energy and its direction. A standard glass washing method and the increase of mechanical and chemical stability of dosimeter glass are described. With a scanning method we can measure energy and direction of incident radiation. A simplified scanning method for glass encased in spherical capsule is described.
Glass encased in a half spherical capsule serves for reading the dose of frontal or backward radiation at our critical organs by the scanning method.
How to obtain a good performance of glass dosimeter for routine personnel dosimetry and long-term environmental monitoring is described.
We have recently succeeded in developing a methoded with UV laser pulse for exciting the glass which enables measurement of 1 mR and a remarkable decrease of soil effect on glass.
抄録全体を表示