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<h2 class="hd hd-2 unit-title">2.1.2. Video Lecture</h2>
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<h4 class="hd hd-5">Transcripts</h4>
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<h2 class="hd hd-2 unit-title">2.1.2. Additional Material</h2>
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<ul>
<li><strong>Fissionable materials</strong> = isotopes that are capable of undergoing nuclear fission after capturing <strong>either high or low energy neutrons.</strong></li>
<li><strong>Fissile matarials</strong> = fissionable isotopes that are capable of undergoing nuclear fission <strong>only after capturing a thermal neutron.</strong> </li>
<li><strong>Fertile material</strong> = isotopes that are not fissionable by thermal neutrons, <strong>but can be converted into fissile isotopes </strong>(neutron absorption and subsequent decay).</li>
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<h3 class="hd hd-2">Uranium Mining Process</h3>
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<h2 class="hd hd-2 unit-title">2.1.2. Required Assessment</h2>
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Assessment 1
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<legend id="0668afb709254e26a38e2c42a2ca365f_2_1-legend" class="response-fieldset-legend field-group-hd">How does the fission chain reaction in a power reactor differ from the fission chain reaction in a nuclear weapon?</legend>
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<span class="status unanswered" id="status_0668afb709254e26a38e2c42a2ca365f_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
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<div class="action">
<input type="hidden" name="problem_id" value="Assessment 1" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_0668afb709254e26a38e2c42a2ca365f" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_0668afb709254e26a38e2c42a2ca365f">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
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<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
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<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
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<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="0668afb709254e26a38e2c42a2ca365f-problem-title">None
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<div class="notification general notification-show-answer
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data-graded="True">
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