Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Neutron emission yana faruwa a cikin yanayi mai wuya wanda ƙwayoyin cuta ke dauke da ƙarin neutrons. Kwayoyin da ba su da kwanciyar hankali na wannan nau'in sau da yawa za su lalace da sauri, tare da rabin rabin rabi na wani ɓangare na biyu. Saurin neutrons yawanci ba'a so a cikin mahaɗan nukiliya mai ɗorewa saboda yawancin man fissile yana da saurin amsawa tare da neutrons na thermal. Ana iya canza neutrons masu sauri cikin sauri zuwa neutrons na thermal ta hanyar aikin da ake kira moderation. Ana yin wannan ta hanyar haɗuwa da yawa tare da (gabaɗaya) jinkirin motsi da sabili da haka ƙananan zafin jiki kamar ƙwayoyin atomatik da sauran neutrons. Wadannan haɗuwa za su hanzarta sauran ƙwayoyin kuma su rage jinkirin neutron kuma su warwatsa shi. Ainihin, ana amfani da mai kula da neutron mai zafin jiki na ɗaki don wannan aikin. A cikin reactors ruwa mai nauyi, ruwa mai sauƙi, ko graphite galibi ana amfani dasu don daidaita neutrons.  Tambaya: Yaya jinkirin neutrons ta hanyar mai gudanarwa?
Ana iya canza neutrons masu sauri cikin sauri zuwa neutrons na thermal ta hanyar aikin da ake kira moderation.