JP2019508707A - 放射線感受性熱可塑性複合パネル - Google Patents
放射線感受性熱可塑性複合パネル Download PDFInfo
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Abstract
Description
MFX1−zIzuMaXa:yA:eQ:tD (I)
(式中、Mは、Mg、Ca、Sr、Baおよびこれらの組合せからなる群から選択され、
Xは、Cl、Brおよびこれらの組合せからなる群から選択され、
Maは、Na、K、Rb、Csおよびこれらの組合せからなる群から選択され、
Xaは、F、Cl、Br、Iおよびこれらの組合せからなる群から選択され、
Aは、Eu、Ce、Sm、Th、Biおよびこれらの組合せからなる群から選択され、
Qは、BeO、MgO、CaO、SrO、BaO、ZnO、Al2O3、La2O3、In2O3、SiO2、TiO2、ZrO2、GeO2、Nb2O5、Ta2O5、ThO2およびこれらの組合せからなる群から選択され、
Dは、V、Cr、Mn、Fe、Co、Niおよびこれらの組合せからなる群から選択され、
zは、約0.0001〜約1であり、
uは、約0〜約1であり、
yは、約0.0001〜約0.1であり、
eは、0〜約1であり、
tは、0〜約0.01である)
を有する化合物が挙げられるが、これに限定されない。
(Ba1−a−b−cMgaCabSrc)FX1−zIzrMaXa:yA:eQ:tD (II)
(式中、X、Ma、Xa、A、Q、De、t、zおよびyは、式(I)について上に定義した通りであり、a、bおよびcの合計は0〜約0.4であり、rは約10−6〜約0.1である)
を有する化合物が挙げられるが、これに限定されない。
M1+XaM2+X’2bM3+X’’3:cZ (III)
(式中、Mは、Li、Na、K、Cs、Rbおよびこれらの組合せからなる群から選択され、
M2+は、Be、Mg、Ca、Sr、Ba、Zn、Cd、Cu、Pb、Niおよびこれらの組合せからなる群から選択され、
M3+は、Sc、Y、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy Ho、Er、Tm Yb、Lum Al、Bi、In、Gaおよびこれらの組合せからなる群から選択され、
Zは、Ga1+、Ge2+、Sn2+、Sb3+、As3+およびこれらの組合せからなる群から選択され、
X、X’およびX’’は、同一でもまたは異なってもよく、互いに独立に、F、Br、Cl、Iからなる群から選択されるハロゲン原子を表し、0≦a≦1、0≦b≦1、0<c≦0.2。)
を有する化合物が挙げられるが、これに限定されない。
以下に示すように画質評価を行った。押出プレートを、光学的に透明な接着剤(3M 8141)を使用して、黒色PET(Toray Lumirror X30−10mil)支持体に接着させる。次いで、このプレートを、Carestream CS2200X線発生装置に入れ、70kV、7mA、0.16秒のX線曝露にさらす。次いで、この曝露されたプレートを、控えめな(subdued)周囲照明を維持して、Carestream Health CS7600口内歯科用スキャナで、超高解像度モードでスキャンする。画像をJPEGファイルとして保存し、コンピュータモニタ上で欠陥計数について調べた。プレートは、約12.71cm2の面積で、全歯科サイズ(all dental size)2である。
[複合熱可塑性粒子の製造]
フルオロブロモヨウ化バリウム(BFBrI)86重量%および低密度ポリエチレン(LDPE EM811A、Westlake Longview Corp.、Houston,TXから入手可能)14重量%を含む、本開示による無機蓄積性蛍光体/熱可塑性物質の複合ペレットを調製した。
ペレット化した複合熱可塑性材料を、1軸Davis標準押出機に充填した。押出機内の加熱ゾーンを表2に示す温度に設定した。
[複合熱可塑性粒子の製造]
フルオロブロモヨウ化バリウム(BFBrI)83重量%および低密度ポリエチレン(LDPE EM811A、Westlake Longview Corp.、Houston,TXから入手可能)17重量%を含む、本開示による無機蓄積性蛍光体/熱可塑性物質の複合ペレットを調製した。
ペレット化した複合熱可塑性材料を、1軸Davis標準押出機に充填した。押出機内の加熱ゾーンを表4に示す温度に設定した。
[複合熱可塑性粒子の製造]
比較例1に記載したように試料を調製した。比較例1と発明実施例1との次の違いは、青色色素が存在せず、Microtrac9200FRAを用いて、無機蓄積性蛍光体粒子は、粒子の95%が直径≦6.78μmであり、かつ粒子の50%が直径≦3.81μmであると特徴付けられることである。
ペレット化した複合熱可塑性材料を、1軸Davis標準押出機に充填した。押出機内の加熱ゾーンを表6に示す温度に設定した。
[複合熱可塑性粒子の製造]
比較例1に記載したように試料を調製した。主な違いは、青色色素(銅フタロシアニン)レベルが、蛍光体の重量に対して約200ppmであり、Microtrac9200FRAを用いて、無機蓄積性蛍光体粒子は、粒子の95%が直径≦6.00μmであり、かつ粒子の50%が直径≦3.45μmであると特徴付けられることである。
ペレット化した複合熱可塑性材料を、1軸Davis標準押出機に充填した。押出機内の加熱ゾーンを表7に示す温度に設定した。
Claims (7)
- 少なくとも1つのポリマと、無機蓄積性蛍光体材料と、銅フタロシアニン青色色素とを含む、溶融押出、射出成形またはホットプレスされた無機蓄積性蛍光体層を含む、独立型無機蓄積性蛍光体パネルであって、
前記無機蓄積性蛍光体材料は、粒子の95%が直径≦6.8μmであり、かつ粒子の95%が直径≧1.0μmであり、前記蓄積性蛍光体層は、1平方cm当たり5個未満の欠陥を有することを特徴とする独立型無機蓄積性蛍光体パネル。 - 請求項1に記載の蓄積性蛍光体パネルであって、前記無機蓄積性蛍光体材料は、粒子の50%が直径<3.8μmであることを特徴とする蓄積性蛍光体パネル。
- 請求項1に記載の蓄積性蛍光体パネルであって、前記ポリマが、少なくとも1つの熱可塑性ポリオレフィンを含むことを特徴とする蓄積性蛍光体パネル。
- 請求項1に記載の蓄積性蛍光体パネルであって、蓄積性蛍光体スクリーンの潜像が、反射モードの反射スキャニングまたは透過モードの透過スキャニングを用いて読み取られることを特徴とする蓄積性蛍光体パネル。
- 無機蓄積性蛍光体パネルを製造する方法であって、
少なくとも1つの熱可塑性ポリオレフィンと、銅フタロシアニン青色色素と、粒子の95%が直径≦6.8μmであり、かつ粒子の95%が直径≧1.0μmである無機蓄積性蛍光体材料とを含む材料を、溶融押出、射出成形またはホットプレスして、製造無機蓄積性蛍光体層を形成するステップであって、前記蓄積性蛍光体層が5個未満の欠陥を有するステップ、
を含むことを特徴とする方法。 - 請求項5に記載の方法であって、
前記製造無機蓄積性蛍光体層をX線に曝露して、潜像を形成するステップと、
前記製造無機蓄積性蛍光体層の前記潜像を励起光に曝露して、前記潜像のデジタル画像を生成するステップと、
をさらに含み、
蓄積性蛍光体スクリーンの潜像が、反射モードの反射スキャニングまたは透過モードの透過スキャニングを用いて読み取られる
ことを特徴とする方法。 - 請求項5に記載の方法であって、前記無機蓄積性蛍光体材料は、粒子の50%が直径<3.8μmであることを特徴とする方法。
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