a. how many grams of ~~ b. Sr-90 is to be used as a heat source~~ c. Weight of t

Question

a. how many grams of ~~
b. Sr-90 is to be used as a heat source~~
c. Weight of the isotopic heat source~~

3. (a) How many grams of Y are there when y is equilibrated with 10 mg of "Sr? (b) Sr-90 is to be used as a heat source for generating electrical energy in a satellite. How much of Sr-90 activity is required to generate 50 W of electric power if the conversion efficiency from heat to electricity is 30%? (c) Weight of the isotopic heat source is an important factor in design of the power source. If e eightof th lopic heat source is an important factorin design of the power source. If weight is to be kept at a minimum and if the source is to generat would there be an advantage to using 21"Po? is to be kept at a minimum and if the source is to generate 50 W after 1 yer operation

Explanation / Answer

a) grams of 90Y =   10 * 10-3 * 90   = 0.9 gm

b)    Sr-90 activity required =   (50 * 0.30)/0.9

                                              = 16.67 Ci/gm

c) No, there would be no advantage to using 210Po .

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