Lub thickness ntawm boron-polyethylene board yog 2cm-30cm. Nws cov kev siv tshuab yog nuclear technology daim ntawv thov ntawm ionizing radiation tiv thaiv. Boron-polyethylene board yog siv rau kev tiv thaiv cov neutrons ceev ceev ntawm neutron radiation teb, neutron thiab Y sib xyaw radiation teb hauv thaj chaw ntawm ionizing radiation tiv thaiv, los tiv thaiv kev puas tsuaj thiab kev puas tsuaj los ntawm neutron radiation rau cov neeg ua haujlwm thiab pej xeem.
Yuav kom txhim kho qhov cuam tshuam ntawm boron polyethylene rau ntawm cov neutron ceev thiab daws qhov teeb meem uas nws nyuaj rau tsim cov boron polyethylene board lag luam hauv Suav teb, lub rooj tsavxwm polyethylene uas muaj boron nrog cov ntsiab lus boron ntawm 8% tau tsim. Hauv cov ntsiab lus ntawm kev tiv thaiv cov neutron ceev, txij li qhov seem ntawm cov neutrons yog 1.0086649U, thaum cov hydrogen atoms (piv txwv li protons) yog 1.007825 U [1], qhov hnyav atomic ntawm neutrons ze rau cov hydrogen atoms. Yog li ntawd, thaum cov neutron ceev sib tsoo nrog cov hydrogen nuclei hauv lub cev tiv thaiv, Nws yooj yim tshaj plaws kom poob lub zog los ntawm kev hloov nws mus rau lub nucleus ntawm cov hydrogen atom, qeeb qeeb cov neutrons ceev mus rau cov neutrons qeeb thiab cov thermal neutrons. Qhov ntau hydrogen lub cev tiv thaiv muaj, qhov muaj zog dua qhov cuam tshuam moderating yuav yog. Ntawm cov hydrogen ntsiab lus ntawm cov khoom siv neutron shielding feem ntau, cov hydrogen ntsiab lus ntawm polyethylene yog qhov siab tshaj plaws, txog li 7.92x IO22 atoms / cm3 roj. Yog li ntawd, polyethylene yog qhov zoo tshaj plaws moderator rau kev tiv thaiv cov neutrons ceev. Tom qab cov neutrons ceev qeeb qeeb mus rau hauv thermal neutrons, cov ntaub ntawv tiv thaiv nrog cov thermal neutron absorption loj cross section tsis muaj high-energy Y hluav taws xob yog qhov xav tau los nqus cov thermal neutrons, yog li ua tiav lub hom phiaj ntawm kev tiv thaiv cov neutrons ceev tag nrho. Vim yog qhov siab thermal neutron absorption cross section ntawm (3840 lL) X10_24cm2 [3], thiab qhov ntau ntawm kiB hauv cov boron ntuj yog 18.98% [3], uas yooj yim kom tau txais, cov ntaub ntawv muaj boron yog cov khoom nqus tau zoo rau kev tiv thaiv thermal neutrons.
Kev tiv thaiv hluav taws xob neutron hauv cov chaw tsim hluav taws xob nuclear, cov khoom siv hluav taws xob nruab nrab (siab), cov khoom siv atomic reactors, cov nkoj hauv qab dej nuclear, cov khoom siv kho mob accelerators, cov khoom siv kho mob neutron thiab lwm qhov chaw.
Lub sijhawm tshaj tawm: Tsib Hlis-31-2022
