id	keyword
american_scientific_journal-2807	cement
american_scientific_journal-2807	samples
american_scientific_journal-2807	journal
american_scientific_journal-2807	analysis
american_scientific_journal-2807	232th
american_scientific_journal-2807	40k
american_scientific_journal-2807	elements
american_scientific_journal-2807	research
american_scientific_journal-2807	226ra
american_scientific_journal-2807	radiation