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Half-Life
7/16/2023
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Aim: How do we describe half-life? face the fa thad a limask of asted geoteer subenher a word. Aaveran 3 sawan" [ 2 Types of Radioactivity lampin dhe te Hud SITIO 14 cond fluemitting radiation trmas x292 pxmay mex) "C → N+ OF 1) Natural Radioactivity: Spontaneous breakdown of naturally unstable nuclei, O only decay series: -Series of radioactivity that leads to production of stable nucleus to betodu-loex) 92 U 90 Th + arst will flad done 238 234 +2 reactant qjਆਂ - B 2) Artificial / Induced Radioactivity: -bombarding high energy particles with nucleus of an atom (2 reactants) this decay shows two reactants. i A Wether it is stable or unstable A+ alpha 30 p + neutron ex) 235 92 Stable ut (H) (CH) CH tevit baziak lotad self ndo listen af faas to our bila 0 #ploc="[1000 vadioactive → К 36 2 types induced radioactivity to fist sund sind (d 1) Nuclear(fission: Spliting of larger nucleus into smaller nuclei #008 ad=. 234 90 + Th→ reactant 234 2) Nuclear fusion using smaller nucles into larger nucleus : 1000 234 91 reactant in the decay equation. only three isotopes that are tested : U-233, U-235, Pu-238 O ex) the sun. a getting bigger Pa 24 B 0 → 234 > SURT192 Ba + 3/1n) and Hod s les 36 2141 04 o ward hudavid-Hr(ckapor) [20] ex) (7²H+H) → 1/28/22 (everudul) 4→ reactant 2 He 230 90 10 Th + 2 3) Nuclear reactor : device where fission of such 841-WH 30 HOUD ON (30 -moderator -Coolant - Shield (rxn) • Control rod: absorb excess neutron → to regulate the chain reaction I Half-Life "measure of amount time a radioactive isotope takes...
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Alternative transcript:
to decay a half of its amount. the time it takes to decay a half of its original amount shown in [Table N] • Half-Life can be determined by observing the time that led to ½ of the starting amount • Each time that lead to 2 of fraction remaining represent the total # of half lives and can be used to calculate the total elapsed time # of half lives = total elapsed time ( = life) "After each half life, fractional remaining can be calculated as Half-Life Half-life problems Ia 1) If you have 100 grams of a radioactive isotope with a half-life of 10 years: all How much of the isotope will you have left after 10 years? vamiste brigia + 6**** 1009 [509) (10 years) means I half life b) How much of the isotope will you have left after 20 years? Гоо 9 50₁] (10 gears): | half life 25g (20 years) 2 half life C) How many holf-lives will occur in 40 years? 10.8= 4 X=27 4x 4 100g 509 (10 years) 6.25 = 100 (1) half lives 259 (20 years) 4 half life 1-25 (36 years) 6.25g (40 years) 1 TEST LODE 100 (¹50 grams vap (+) Too 2.7 day 100 (2)² = [25] 2) If 100 grams of Au-198 decays to 6.25 grams in 10.8 days, what is the half life of Au-198? 10.8 X = 6.25 100 Igroms 10.8 log •following: 40=4 log/ SP = log 0.0625 log / XX) 10.8 - 4(x) موده need to find!!!