Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands.
J Phys Condens Matter. 2010 Dec 8;22(48):485402. doi: 10.1088/0953-8984/22/48/485402. Epub 2010 Nov 17.
The nonproportional scintillation response of LaBr(3) doped with 5% Ce(3+) and of LaCl(3) doped with 10% Ce(3+) was measured using highly monochromatic synchrotron irradiation. To estimate the photon response, pulse height spectra at many finely spaced energy values between 9 and 100 keV were measured. The experiment was carried out at the X-1 beamline at the Hamburger Synhrotronstrahlungslabor (HASYLAB) synchrotron radiation facility in Hamburg, Germany. Special attention was paid to the x-ray fluorescence escape peaks as they provide us with additional information about photon response in the range 1.2-14.5 keV for LaBr(3):Ce and 2.0-11.6 keV for LaCl(3):Ce. A rapid variation of the photon response curve is observed near the lanthanum K-electron binding energy for both scintillators. A dense sampling of data was performed around this energy and those data are used to apply a method, which we call K-dip spectroscopy. This method allows us to derive the electron response curves of LaBr(3):Ce and LaCl(3):Ce down to energies as low as 0.1 keV.
使用高度单色的同步加速器辐射，测量了掺杂 5% Ce(3+)的 LaBr(3)和掺杂 10% Ce(3+)的 LaCl(3)的非比例闪烁响应。为了估计光子响应，在 9 到 100 keV 之间的许多精细间隔的能量值处测量了脉冲高度谱。该实验是在德国汉堡同步加速器辐射实验室（HASYLAB）的 X-1 光束线上进行的。特别关注 X 射线荧光逃逸峰，因为它们为我们提供了有关 LaBr(3):Ce 范围内的光子响应的附加信息，范围为 1.2-14.5 keV，以及 LaCl(3):Ce 的范围为 2.0-11.6 keV。对于这两种闪烁体，在镧 K 电子结合能附近，光子响应曲线会发生快速变化。在该能量附近进行了密集的数据采样，并且使用这些数据来应用我们称之为 K 谷光谱学的方法。该方法允许我们将 LaBr(3):Ce 和 LaCl(3):Ce 的电子响应曲线推导到低至 0.1 keV 的能量。
