(a)
Interpretation:
The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for background is 7 cpm for time period 2.0 min. The value of corrected counting rate is to be determined.
Concept introduction:
The following formula will be used for the corrected counting rate-
Where,
(b)
Interpretation:
The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for the background is 7 cpm for time period 2.0 min. The value of standard deviation
Concept introduction:
The formula used for the calculation of standard deviation for the corrected counting rate is-
Where,
(c)
Interpretation:
The total counting rate for sample is 450cpm (sample plus background) and the counting period for this rate is 15.0min. The counting rate for background is 7 cpm for time period 2.0 min. The value of 95% confidence interval for the corrected counting rate is to be determined.
Concept introduction:
The formula that will be used-
The formula used for the calculation of standard deviation for the corrected counting rate is-
Where,
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Chapter 32 Solutions
PRINCIPLES OF INSTRUMENTAL ANALYSIS
- The mass, m groms, of a burning candle, t hours after it was lit up, its scrisfies the DE dm dt = -k(m-10) where k is a positive constant. The initial mass of the candle was 120 grams, and 3 hours later its mass is he has halved a) The value of the constant k ? bi Aftere After a further 3 hours has elapsed, the mass of the candle is m?arrow_forwardFor intitial radioactivity, 1 is the highest and 4 is the lowestarrow_forwardSince the radioactivity defined as 1 Ci for 1,00 grams of 226Ra released by 42He2+≡ a(equivalent) particles is 3.7 * 1010 Bq; Find the fragmentation rate constant, the half-time and the fragmentation rate after 999 years.arrow_forward
- Radioactive decay The radioactive bismuth isotope 21°BI has a half-life of 5 days. If there is 100 milligrams of 210Bi present at t = 0, then the amount f(t) remaining after t days is given by f(t) = 100(2) 5. (a) How much 210BI remains after 5 days? 10 days? 12.5 days? (b) Sketch the graph of f for 0 sts 30.arrow_forwardA 0.0100 g sample of a radioactive isotope with a half-life (to.s) of 1.3-10° yr decays at the rate of 2.9-10* disintegrations per minute (dpm). Calculate i) decay constant (1) (in unit min-1) ii) number of nuclei (N)| iii) molar mass (M) of the isotope.arrow_forwardWhat is the process of elution in extracting Ba-137 from the Isotope Generator (2-3 sentences would doarrow_forward
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- An atomic isotope radioactively decays and has a half-life of 23.7 days. How many days will it take for 88.2% of the sample to decay? In([A]MA]) = -kt t1/2 = (In2/k) 券 (1/[A]) = kt + (1/AI,) t1/2 (1/k[A],) [A]=-kt + [Alo t1/2 = ([A]/2k) In(k2/kq) = (E/R)[(1/T;)- (1/T2)] R= 0.0820573L atm/(K mol) उस R = 8.31446 J 7(K mol) Type your answer in the space below without the units.arrow_forwardThe nuclide 0 (atomic mass, 17.99916 u) is produced by the B* decay of F (atomic mass 18.00094 u). What is the decay energy? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BI US Paragraph Arial 14px ... I * O O Q 5 E = x X, ABC | 田田用国 田用国 Ť (1) O WORDS POWERED BY T +]arrow_forward6. Iridium is a radioactive elementused fortherapy in nucle arme dicine. It decaysto% or 21, of its original mass after 74 days. After148 days, it de caysto %, or 2:2, of its original mass. a) what fraction remains after 222 days? Write fraction as a powerof 2 with a ne gative exponentalso. b) What fraction remains after 370 days? Write fraction as a powerof 2 with a ne gative exponentalso.arrow_forward
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