【摘要】：本文對(duì)中子受激輻射計(jì)算機(jī)斷層掃描成像(NSECT)系統(tǒng)進(jìn)行了仿真計(jì)算,包括中子源的選擇、準(zhǔn)直屏蔽系統(tǒng)的設(shè)計(jì)、屏蔽墻和靶體的設(shè)置以及探測(cè)器的布置.采用MCNP程序模擬了D-T中子源產(chǎn)生的14MeV左右中子束在NSECT系統(tǒng)中轟擊代替人體組織的圓柱體水體模的中子輸運(yùn)過(guò)程,記錄并獲得了元素特征γ射線和出射中子的通量分布及能譜圖,該研究對(duì)中子成像平臺(tái)的搭建有指導(dǎo)作用.從特征γ射線和出射中子的通量分布及能譜可知,在Z=0的平面上與中子束傳播方向呈43.6° 50.9°的方向上布置高能γ探測(cè)器更利于得到可靠的成像數(shù)據(jù),其中48.5°方向上可得到最佳的成像數(shù)據(jù).從特征γ射線能譜找到了~(16)O對(duì)應(yīng)的特征峰,特征峰能量與靶體元素的激發(fā)能完全一致,說(shuō)明NSECT具備元素識(shí)別和確定元素濃度的能力,證明了NSECT被應(yīng)用到癌癥的早期或超早期診斷以及檢查藏匿的炸藥、毒品等領(lǐng)域的可能性.
[Abstract]:In this paper, the (NSECT) system of neutron stimulated radiation computed tomography imaging is simulated, including the selection of neutron source, the design of collimating shielding system, the setting of shielding walls and targets and the arrangement of detectors. The neutron transport process of 14MeV left and right neutron beams produced by D-T neutron source in the NSECT system was simulated by MCNP program. The flux distribution and energy spectrum of elemental characteristic 緯-rays and eject neutrons were recorded and obtained. This study can be used as a guide to the construction of neutron imaging platform. From the flux distribution and energy spectrum of the characteristic 緯 ray and the ejector, it can be seen that the high energy 緯 detector is more suitable for obtaining reliable imaging data on the plane of Z0 and the direction of neutron beam propagation is 43.6 擄/ 50.9 擄. The best imaging data can be obtained in the direction of 48.5 擄. The characteristic peak corresponding to ~ (16) O is found from the characteristic 緯 ray spectrum. The energy of the characteristic peak is completely consistent with the excitation energy of the target element, which indicates that NSECT has the ability to identify and determine the element concentration. It proves that NSECT can be used in the early or super early diagnosis of cancer and the detection of hidden explosives, drugs and so on.
【作者單位】： 蘭州大學(xué)核科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(編號(hào):11305083) 蘭州大學(xué)中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)(編號(hào):lzujbky-2016-27)資助
【分類號(hào)】：O571.5

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