Rikkyo Gakuin

Other

Juntendo Educational Foundation

Akio Urushiyama

Yuji Tomizawa

Chie Kurokawa

Kiyomitsu Shinsho

The present invention aims to provide a photostimulable phosphor for obtaining a two-dimensional or three-dimensional dosimeter, the photostimulable phosphor exerting superior handleability, exhibiting superior biological equivalence, and having superior precision. The present invention also aims to provide a laminate using the photostimulable phosphor. The aforementioned objects are achieved by means of a method for producing a photostimulable phosphor, the method comprising a step A for mixing lithium tetraborate, boron oxide and silver oxide and a step B for obtaining the photostimulable phosphor comprising lithium heptaborate as a base material and silver as a luminescent center present in the base material by firing the aforementioned mixture at 820 to 860&#xb0; C., wherein the molar ratio between the lithium tetraborate and the boron oxide in the step A is X:1 (X&#x3e;1), and the amount of the silver oxide is 0.06 to 1.0 mass % relative to the total mass of the lithium tetraborate and the boron oxide.

Silver-containing lithium heptaborate photostimulable phosphor, method for producing same, and laminate using said photostimulable phosphor

The present invention provides a thermoluminescent phosphor for obtaining a two-dimensional or three-dimensional dosimeter for measuring dose absorbed by biological tissues, which phosphor has superior handleability, superior biological tissue equivalence, and superior precision. It is produced by a method comprising (A1) mixing LiBO, BOand MnO, (A2) firing the mixture at 770 to 840&#xb0; C., and (A3) obtaining the thermoluminescent phosphor comprising lithium triborate as a base material and manganese as a luminescent center present in the base material by further adding and mixing LiBOinto the fired product and then firing the mixture at 770 to 840&#xb0; C., wherein the molar ratio of LiBO:BOin A1 is 1:X (1&#x3c;X&#x2266;4), MnOis 0.02 to 1.0 mass % relative to the total mass of the BOand the total amount of the LiBOadded in A1 and A3, and LiBOin A3 is (X-1) mol relative to 1 mol of the BO.

Manganese-containing lithium triborate thermoluminescent phosphor, and method for producing same

There is provided a thermoluminescent phosphor characterized in that a distribution of the emission intensity of thermoluminescence is present in a visible range that does not overlap the peak of the heating-caused emission intensity of the thermoluminescent phosphor itself and also has one peak within a temperature range in which a resin to be used as a binder can resist heat optically. There is also provided a method of producing the thermoluminescent phosphor. More specifically, there are provided a thermoluminescent phosphor that comprises lithium heptaborate as a base material and copper as a luminescent center present in the base material and which is characterized in that the distribution of the emission intensity of thermoluminescence versus temperature is a sole and monomodal distribution within the range of from 45&#xb0; C. to 130&#xb0; C., and a method of producing the thermoluminescent phosphor.

Thermoluminescent phosphor and method of producing the same

Provided are a dosimeter which uses thermoluminescent plates and with which a three-dimensional dose distribution of radiation can be acquired, a method of producing the dosimeter, and a method of using the dosimeter. A thermoluminescent layered productis constituted of a plurality of thermoluminescent plateswhich are layered. Each of the thermoluminescent platesis constituted of a thermoluminescent phosphor containing no aluminum (III) and a heat-resistant resin. The thermoluminescent phosphor comprises lithium tetraborate as a base material and manganese as a luminescent center contained in the base material.

Thermoluminescent layered product, thermoluminescent plate, method of producing thermoluminescent layered product, method of producing thermoluminescent plate and method of acquiring three-dimensional dose distribution of radiation

Growing community of inventors

Tokyo, Japan

Akio Urushiyama