Nūhou

ʻO ka mānoanoa o ka papa boron-polyethylene he 2cm-30cm. ʻO kāna kahua loea ka hoʻohana ʻana i ka ʻenehana nukelea o ka pale ʻana i ka radiation ionizing. Hoʻohana ʻia ka papa Boron-polyethylene no ka pale ʻana i nā neutrons wikiwiki o ke kahua radiation neutron, neutron a me ke kahua radiation i hui pū ʻia ʻo Y ma ke kahua o ka pale ʻana i ka radiation ionizing, e pale aku i ka pōʻino a me ka hōʻino ʻana o ka radiation i hoʻokumu ʻia e ka radiation neutron i nā limahana hana a me ka lehulehu.
I mea e hoʻomaikaʻi ai i ka hopena pale o ka boron polyethylene ma ka neutron wikiwiki a hoʻoponopono i ka pilikia he paʻakikī ke hana i ka papa polyethylene boron ma ke kālepa ʻana ma Kina, ua hoʻomohala ʻia kahi papa polyethylene me ka boron me ka boron content o 8%. Ma ke ʻano o ke kumumanaʻo o ka pale ʻana i nā neutrons wikiwiki, ʻoiai ʻo ke kaumaha koena o nā neutrons he 1.0086649U, ʻoiai ʻo ka nui o nā ʻātoma hydrogen (ʻo ia hoʻi nā protons) he 1.007825 U [1], kokoke ka nui o ka atomic o nā neutrons i ko nā ʻātoma hydrogen. No laila, i ka wā e kuʻi ai ka neutron wikiwiki me nā nuclei hydrogen i loko o ke kino pale, ʻoi aku ka maʻalahi o ka nalowale ʻana o ka ikehu ma ka hoʻoili ʻana iā ia i ka nucleus o ka ʻātoma hydrogen, e hoʻolohi ana i nā neutrons wikiwiki i nā neutrons lohi a me nā neutrons thermal. ʻO ka nui o ka hydrogen i loko o ke kino pale, ʻoi aku ka ikaika o ka hopena moderating. Ma waena o ka nui o ka hydrogen o nā mea pale neutron i hoʻohana pinepine ʻia, ʻo ka nui o ka hydrogen o ka polyethylene ka mea kiʻekiʻe loa, a hiki i ka 7.92x IO22 atoms /cm3 gas. No laila, ʻo ka polyethylene ka moderator maikaʻi loa no ka pale ʻana i nā neutrons wikiwiki. Ma hope o ka lohi ʻana o nā neutron wikiwiki i nā neutron thermal, pono nā mea pale me ka ʻāpana keʻa omo neutron thermal nui me ka ʻole o ka radiation Y ikehu kiʻekiʻe e omo i nā neutron thermal, i mea e hoʻokō ai i ke kumu o ka pale ʻana i nā neutron wikiwiki. Ma muli o ke keʻa omo neutron thermal kiʻekiʻe o (3840 lL)X10_24cm2[3], a ʻo ka nui o kiB i loko o ka boron kūlohelohe he 18.98% [3], he mea maʻalahi ke loaʻa, he mea omo maikaʻi nā mea i loaʻa ka boron no ka pale ʻana i nā neutron thermal.
Ka palekana ʻana i ka radiation Neutron i nā mea kanu mana nuklea, nā mea hoʻolalelale ikehu waena (kiʻekiʻe), nā mea hoʻouluulu atomika, nā mokukaua nuklea, nā mea hoʻolalelale lapaʻau, nā lako hana neutron a me nā wahi ʻē aʻe.