Two dimensional element mapping technique SPECT-PIXE using extracted proton beam

我们希望开发一种新的粒子感生X射线发射测量的所谓SPECT-PIXE，它具有二维元素映射的可能性，没有微束线。为此，我们尝试了1）利用CdTe探测器进行PIXE的可能性，2）利用引出质子束进行PIXE，并利用MCNP粒子输运程序进行了模拟计算，设计了用于PIXE的针孔准直器。1）模拟验证了针孔准直器可以聚焦粒子激发和发射的X射线。2）作为多阵列CdTe探测器的模型器件，3）利用自行研制的针孔准直器实现了X射线和γ射线的聚焦; 4）利用CdTe阵列探测器实现了针孔准直器对X射线和γ射线的聚焦。然而，CdTe探测器没有足够的能量分辨率来进行特征X射线分离。5）实验表明，CdTe散粒关键CdTe阵列探测器或Si针光电二极管阵列探测器适用于SPECT PIXE系统。6）我们确保使用提取的质子束进行PIXE测量。7）我们确保放大倍数为10的针孔准直器可以获得14 μmIn样品，本文提出的SPECT-PIXE新技术，在20 μm左右的位置分辨率下，实现了二维元素成图的可能性。系统将使用X射线衍射仪，如Frenel波带板，以提高位置分辨率。

We want to develop a new particle induced X-ray emission measurement of the so-call SPECT-PIXE which has a possibility of 2 dimensional element mapping without the microbeamline. To do this, we try to test that 1) possibility of PIXE using CdTedetector, 2) PIXE using extracted proton beam to air, and also we perform simulations using MCNP particle transport code to design the pin-hole collimator for the put-hole PIXE.We made the above mentioned tests ;1) Simulation which the particle induced and emitted X-ray can be focus using pin-hole collimator had been confirmed.2) As a model device for multi-array CdTe detector, we made a FOS-Image intesifire X-ray camera.3) Experimentally, X ray and gamma ray can be focused using pin-hole collimator developed the X-ray camera.4) Experimentally, X ray and gamma ray can be focused using pin-hole collimator using CdTe array detector. However, the CdTe detector did not have enough energy resolution for charasteristic X ray separation.5) It was shown the CdTe shotkey CdTe array detector or Si-pin-photodiode array detector are sutable for the SPECT PIXE system.6) We make sure PIXE measurements using extracted proton beam.7) We make sure that pin-hole collimator of magnification factor 10 can obtain the 14 μmIn sammry, the proposed new technique of SPECT-PIXE is confiemed a possibility of 2 dimentional element mapping in position resolution about 20 μm. The system will be improved position resolution using X-ray lense such as Frenel-Zone plate.