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In page Children of the Atom:

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Groff Conklin praised the novel for its "richness of character development."[3] Boucher and McComas, however, were disappointed by it, saying that while the stories it was based on were first-rate, the novel-length expansion had become "talkative, oversimplified, lacking in suspense or conflict, and, in short, just not adding up to an adequate novelistic treatment of a splendidly stated theme."[4] P. Schuyler Miller, despite acknowledging that the expansion was less effective than the original work, still concluded that it was "representative of the kind of thing science fiction does well."[5]