Assertion: heavy water's absorption section | /r/HasProperty | macroscopic
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text: For instance, heavy water is about eight times less efficient than light water for slowing down ("moderating") neutrons, but its macroscopic absorption cross-section (i.e. probability of absorption) is over 600 times less, leading to a moderating ratio (the ratio of the two parameters, a useful measure of a moderator's quality) that is 80 times higher than that of light water.