Lub thickness ntawm boron-polyethylene board yog 2cm-30cm.Nws txoj haujlwm yog kev siv tshuab hluav taws xob siv hluav taws xob ntawm ionizing hluav taws xob tiv thaiv.Boron-polyethylene board yog siv los tiv thaiv cov hluav taws xob ceev ceev ntawm cov hluav taws xob hluav taws xob hauv hluav taws xob, neutron thiab Y sib xyaw hluav taws xob hauv kev tiv thaiv hluav taws xob ionizing, tiv thaiv hluav taws xob thiab kev puas tsuaj los ntawm cov hluav taws xob neutron rau cov neeg ua haujlwm thiab cov pej xeem.
Txhawm rau txhim kho cov nyhuv shielding ntawm boron polyethylene ntawm ceev neutron thiab daws qhov teeb meem uas nws nyuaj rau tsim boron polyethylene board ua lag luam nyob rau hauv Tuam Tshoj, ib tug boron-muaj polyethylene board nrog boron ntsiab lus ntawm 8%.Nyob rau hauv cov nqe lus ntawm lub hauv paus ntsiab lus ntawm shielding ceev neutrons, txij li thaum lub so ntawm neutrons yog 1.0086649U, thaum lub hydrogen atoms (ie protons) yog 1.007825 U [1], lub atomic mass ntawm neutrons yog ze rau ntawm hydrogen atoms.Yog li ntawd, thaum lub ceev neutron collides nrog hydrogen nuclei nyob rau hauv lub shielding lub cev, Nws yog ib qho yooj yim mus poob lub zog los ntawm kev xa mus rau lub nucleus ntawm hydrogen atom, slows down ceev neutrons qeeb neutrons thiab thermal neutrons.Qhov ntau hydrogen lub shielding lub cev muaj, qhov muaj zog ntawm cov nyhuv moderating yuav.Ntawm cov ntsiab lus hydrogen ntawm feem ntau siv neutron shielding cov ntaub ntawv, cov ntsiab lus hydrogen ntawm polyethylene yog siab tshaj, mus txog 7.92x IO22 atoms / cm3 gas.Yog li ntawd, polyethylene yog tus neeg saib xyuas zoo tshaj plaws rau kev tiv thaiv cov neutrons ceev.Tom qab ceev neutrons qeeb qeeb rau hauv thermal neutrons, shielding cov ntaub ntawv nrog loj thermal neutron absorption cross section yam tsis muaj high-zog Y hluav taws xob yuav tsum tau nqus thermal neutrons, thiaj li ua tiav lub hom phiaj ntawm shielding ceev neutrons kiag li.Vim lub siab thermal neutron absorption cross section ntawm (3840 lL)X10_24cm2 [3], thiab cov nplua nuj ntawm kiB hauv ntuj boron yog 18.98% [3], uas yog ib qho yooj yim kom tau, boron-muaj cov ntaub ntawv yog absorbent zoo rau shielding thermal. neutrons.
Neutron hluav taws xob tiv thaiv hauv nuclear fais fab nroj tsuag, nruab nrab (siab) lub zog accelerators, atomic reactors, nuclear submarines, kho mob accelerators, neutron therapy khoom thiab lwm qhov chaw.
Post lub sij hawm: May-31-2022
