| tobacco | 0.45 |
| dissolve in dilute acids | 0.54 |
| deposited on substrate | 0.33 |
| be a layer of plating | 0.25 |
| kill litvinenko | 0.25 |
| delivered in concentrat… | 0.16 |
| diffuse through inadequ… | 0.16 |
| radioactive | 0.59 |
| soluble | 0.50 |
| rare | 0.45 |
| toxic | 0.41 |
| pure | 0.25 |
| a chemical element | 0.60 |
| metal | 0.57 |
| produced | 0.60 |
| discovered by pierre cu… | 0.57 |
| produced in milligram q… | 0.35 |
| used as initiator | 0.33 |
| discovered in 1898 | 0.33 |
| ingested | 0.31 |
| used to eliminate stati… | 0.25 |
| discovered by marie | 0.25 |
| grown with phosphate fe… | 0.25 |
| plated with gold | 0.25 |
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