HW2 - STELLA1

# HW2 - STELLA1 - Timothy Lin CEE 3510 Homework 2 Stella 1...

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Timothy Lin CEE 3510 Homework 2 – Stella 1 due: 2/17 1) With your original amount of 1000 Curies of 226 Ra and a decay rate of 0.0004279/year, how much source will remain in 1000 years, 2000 years, and 10,000 years? Note, you will need to change the simulation time to 10,000 years to answer this question. At the end of this assignment I summarize what you need to turn in. In addition to the answer to the above question you will need to turn in a print out of your model diagram for 226 Ra, your listing of equations, as well as a graph and a table for your simulation. Answer : Source remaining in 1,000 years: 651.82 Curries 2,000 years: 424.87 Curries 10,000 years: 13.84 Curries Diagram : Equations : 1

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Graph : Table : 2) Now let's change a couple of the parameters in your model. Go to the Equation view. Double-click on the equation for SOURCE. A definition box should open up. Position the cursor just behind the last zero in 1000. Click-and-hold. While still holding down the click button, move the mouse to the left so that all of 1000 becomes highlighted. Release the click. Type in 500. Make sure your 2
units are still in brackets. Click on OK. Now the initial amount of source is different. Double-click on FRACTION_DECAYING. Use the mouse to position the cursor, just behind the 9 in 0.0004279.

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## This note was uploaded on 03/01/2010 for the course CEE 3510 taught by Professor Lion during the Spring '10 term at Cornell.

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HW2 - STELLA1 - Timothy Lin CEE 3510 Homework 2 Stella 1...

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