Nkhani

Makulidwe a bolodi-polyethylene board ndi 2cm-30cm. Ntchito yake yaukadaulo ndiukadaulo waukadaulo wogwiritsa ntchito chitetezo cha ionizing radiation. Boron-polyethylene bolodi ntchito kutchinga manyutroni kudya nyutroni cheza munda, nyutroni ndi Y osakaniza cheza kumunda m'munda wa ionizing cheza chitetezo, kuteteza poizoniyu kuwonongeka ndi kuwonongeka chifukwa cha nyutroni poizoniyu kwa ogwira ntchito ndi anthu.
Pofuna kupititsa patsogolo chitetezo cha boron polyethylene pa nyutroni yofulumira ndi kuthetsa vuto lomwe n'zovuta kupanga boron polyethylene bolodi ku China, bolodi yokhala ndi polyethylene yokhala ndi boron 8% inapangidwa. Kumbali ya mfundo yoteteza manyutroni othamanga, popeza manyutroni ena onse ndi 1.0086649U, pomwe maatomu a haidrojeni (ie ma protoni) ndi 1.007825 U [1], kuchuluka kwa ma atomiki a ma neutroni kuli pafupi ndi maatomu a haidrojeni. Choncho, pamene nyutroni yofulumira igundana ndi nyuturoni ya haidrojeni mu thupi lotchinga, Ndikosavuta kutaya mphamvu mwa kusamutsira ku phata la atomu ya haidrojeni, kuchepetsa manyutroni othamanga kuti muchepetse manyutroni ndi manyutroni otentha. Pamene thupi loteteza lili ndi haidrojeni, mphamvu yochepetsera imakhala yamphamvu. Pakati pa ma haidrojeni omwe amagwiritsidwa ntchito kwambiri poteteza manyutroni, ma hydrogen okhala ndi polyethylene ndiwokwera kwambiri, mpaka 7.92x IO22 maatomu / cm3 mpweya. Chifukwa chake, polyethylene ndiye woyang'anira wabwino kwambiri poteteza ma neutroni othamanga. Manyutroni othamanga akachepetsedwa kukhala ma neutroni otentha, zida zotchingira zokhala ndi gawo lalikulu la mayamwidwe a neutroni popanda ma radiation a Y amphamvu amafunikira kuti atenge ma neutroni otentha, kuti akwaniritse cholinga chotchinjiriza ma neutroni othamanga kwathunthu. Chifukwa cha kuchuluka kwa mayamwidwe a neutroni (3840 lL) X10_24cm2[3], komanso kuchuluka kwa kiB mu boroni wachilengedwe ndi 18.98% [3], yomwe ndiyosavuta kupeza, zida zokhala ndi boroni zimayamwa bwino poteteza ma neutroni otentha.
Chitetezo cha ma radiation ya nyutroni m'mafakitale amagetsi a nyukiliya, ma accelerators apakati (apamwamba), ma atomiki, masitima apamadzi a nyukiliya, ma accelerators azachipatala, zida zamanyutroni ndi malo ena.