Lalacewar hasken rana na foda graphite yana da tasiri mai mahimmanci akan aikin fasaha da tattalin arziki na reactor, musamman ma reactor mai sanyaya iskar gas mai zafi. Hanyar daidaita neutron shine watsawa mai laushi na neutrons da atoms na kayan daidaitawa, kuma makamashin da suke ɗauka ana canjawa zuwa atoms na kayan daidaitawa. Foda graphite kuma kyakkyawan zaɓi ne ga kayan da ke da alaƙa da plasma don reactors na haɗakar nukiliya. Editocin Fu Ruite masu zuwa sun gabatar da amfani da foda graphite a gwaje-gwajen nukiliya:
Da ƙaruwar tasirin neutron, foda na graphite zai fara raguwa, kuma bayan ya kai ƙaramin ƙima, raguwar ta ragu, ta koma girmanta na asali, sannan ta faɗaɗa da sauri. Domin amfani da neutrons ɗin da aka saki ta hanyar fission yadda ya kamata, ya kamata a rage su. Ana samun halayen zafi na foda na graphite ta hanyar gwajin radiation, kuma yanayin gwajin radiation ya kamata ya zama iri ɗaya da yanayin aiki na reactor. Wani ma'auni don inganta amfani da neutrons shine amfani da kayan haske don nuna neutrons ɗin da ke fitowa daga yankin tsakiya na amsawar fission na nukiliya. Tsarin nunin neutron kuma shine watsawar roba na neutrons da atoms na kayan haske. Domin sarrafa asarar da ƙazanta ke haifarwa zuwa matakin da aka yarda, foda na graphite da ake amfani da shi a cikin reactor ya kamata ya zama tsarkakakken nukiliya.
Foda graphite na nukiliya wani reshe ne na kayan foda na graphite da aka haɓaka don biyan buƙatun gina reactors na fission na nukiliya a farkon shekarun 1940. Ana amfani da shi azaman mai daidaitawa, tunani da kayan gini a cikin reactors na samarwa, reactors masu sanyaya iskar gas da reactors masu sanyaya iskar gas mai zafi. Ana kiran yuwuwar amsawar neutron da nucleus ɗin, kuma sashin fission na thermal neutron (matsakaicin kuzarin 0.025eV) na U-235 yana da maki biyu sama da sashin fission na fission neutron (matsakaicin kuzarin 2eV). Modulus na roba, ƙarfi da haɗin fadada layi na foda graphite yana ƙaruwa tare da ƙaruwar tasirin neutron, yana kaiwa babban ƙima, sannan yana raguwa da sauri. A farkon shekarun 1940, foda graphite kawai ake samu a farashi mai araha kusa da wannan tsarkin, shi ya sa kowane reactor da reactors na samarwa na gaba suka yi amfani da foda graphite a matsayin kayan daidaitawa, suna haifar da zamanin nukiliya.
Mabuɗin yin foda mai siffar isotropic graphite shine amfani da barbashi na coke masu kyau isotropy: coke mai siffar isotropic ko macro-isotropic coke na sakandare da aka yi daga anisotropic coke, kuma galibi ana amfani da fasahar coke na sakandare a halin yanzu. Girman lalacewar radiation yana da alaƙa da kayan da aka yi amfani da su na foda mai siffar graphite, tsarin kera shi, saurin tasirin neutron da saurin tasirinsa, zafin hasken rana da sauran abubuwa. Ana buƙatar adadin boron na foda mai siffar nuclear graphite ya kasance kusan 10-6.
Lokacin Saƙo: Mayu-18-2022