rru,2 \ov on rnr so t M6n thi: vaT r,.f r-o pnAlv trNc HAT NHAX (srl PHAM) Thli gian lirm biri: 120 phft Ngiy thi: cAu I (1 aD. Phin rr?ng phin h?ch h4t nhin ueng neutron nhiQt. cho mdt vi du. c4u 2 Q d). MQt nhir miy rtiQn h3t nhin c6 c6ng suAt 300MW". HiQu suit nhdr mriy ttiQn li 30%. 1. H6i s6 phAn h4ch xiy ra trong mQt ngiy. 2. IJ.bi t<triii tu.mg "tU Aiit cnay t.ot g mQt:ngay Gie sfr mdi srp kign phfln h4ch t4o ra ZOOiVI"V. CAU 3 (3 iI). X6t ph:in rring phffn h4ch sau: / , jn * "ntru - ('ilu). -+ 'l!cs + linu + l(jn)+ E Trong d6 3 neutron phan h4c^h trfrc thcri c6 tdng tt0n'g ning l^ s,2 Mev vdr c6c tia gamma trfrc.thcri c6 t6ng ning l*gng oi rvr"v. rir nnng tliing vi ngucri ta th6y sau 3 tAn phin r{ beta,-r*cs tr& thirnh ttiing vi 6cn tro"a. vd sau 4 dn phfln ri beta, ntRb tr& thirnh diing vi bAn "Nn.Ilay tinh: 1. NIng luqng trfrc thtri giii ph6ng ra tir -srp kiQn phin hgch nAy. 2. Niing tuqrng phrflt ra th6m {o cic chu6i phffn ri beta thf'l sau khi ptrAn h4ch. 3. Ning lugng phrlt ra th6m do cric chu6i ph6n ri beta thfi.,2 sau khi nhin hach. ) cho bi6t : Kh6i luqng cfia 23su, tn, to'cs, ,rRb, tooC., ,tNb vi electron lin 'lugt li 235,043i24; ,008665; 139,90910; 92,91699, 139,90543, 92,90638vdr0,0005486u. I Cr. , RL Cu Flb t- cAU 4 (4 d). Virng holt cria mQt td phin li'ng trf,n giim nhidiu thanh kim loai uranium tg nhi6n ddri c6 tlulng kinh is,+ ^i sip xt-ip trong tirng 6 vu6ng c6 cgnh 1-,52 dm vi nhring chim trong mQt thirng hinh vi6n trg chrfra nu6c cd ti sii chidu cao - ttulng kinh l 1,2. Tir cric tintr ctrdt c,iu tit liQu ngucri ta bi6t dugc B1, = 8,6m-2. Tfnh: y . 79 - r0r Vgt^) 1. Tfnh kfch thuri,c cfra virng ho?t: b6n kfnh R li bao nhi6u m vi chi6u cao H Ii bao nhi6u m6t 2. Sii thanh nhi6n li_6u n ldr bao nhi6u thanh. 3. The tich nhi6n tiQu V lir bao "fri6r ilt f.frai. 4. Kh6i luqng nhiGn ligu M ti bao nhi6u tdn. ffi e#n -/fu . ,tNb vi electron lin 'lugt li 235, 043 i 24; ,008665; 139,90910; 92,91699, 139,90 543 , 92,90638vdr0,000 548 6u. I Cr. , RL Cu Flb t- cAU 4 (4 d). Virng holt cria mQt td phin. h4ch t4o ra ZOOiVI"V. CAU 3 (3 iI). X6t ph:in rring phffn h4ch sau: / , jn * "ntru - ('ilu). -+ 'l!cs + linu + l(jn)+ E Trong d6 3 neutron phan h4c^h. vi ngucri ta th6y sau 3 tAn phin r{ beta,-r*cs tr& thirnh ttiing vi 6cn tro"a. vd sau 4 dn phfln ri beta, ntRb tr& thirnh diing vi bAn "Nn.Ilay tinh: 1.