Ricin as a Terrorist Tool
This paper (full paper behind paywall)—from Environment International (2009)—does a good job of separating fact from fiction:
Abstract: In recent years there has been an increased concern regarding the potential use of chemical and biological weapons for mass urban terror. In particular, there are concerns that ricin could be employed as such an agent. This has been reinforced by recent high profile cases involving ricin, and its use during the cold war to assassinate a high profile communist dissident. Nevertheless, despite these events, does it deserve such a reputation? Ricin is clearly toxic, though its level of risk depends on the route of entry. By ingestion, the pathology of ricin is largely restricted to the gastrointestinal tract where it may cause mucosal injuries; with appropriate treatment, most patients will make a full recovery. As an agent of terror, it could be used to contaminate an urban water supply, with the intent of causing lethality in a large urban population. However, a substantial mass of pure ricin powder would be required. Such an exercise would be impossible to achieve covertly and would not guarantee success due to variables such as reticulation management, chlorination, mixing, bacterial degradation and ultra-violet light. By injection, ricin is lethal; however, while parenteral delivery is an ideal route for assassination, it is not realistic for an urban population. Dermal absorption of ricin has not been demonstrated. Ricin is also lethal by inhalation. Low doses can lead to progressive and diffuse pulmonary oedema with associated inflammation and necrosis of the alveolar pneumocytes. However, the risk of toxicity is dependent on the aerodynamic equivalent diameter (AED) of the ricin particles. The AED, which is an indicator of the aerodynamic behaviour of a particle, must be of sufficiently low micron size as to target the human alveoli and thereby cause major toxic effects. To target a large population would also necessitate a quantity of powder in excess of several metric tons. The technical and logistical skills required to formulate such a mass of powder to the required size is beyond the ability of terrorists who typically operate out of a kitchen in a small urban dwelling or in a small ill-equipped laboratory. Ricin as a toxin is deadly but as an agent of bioterror it is unsuitable and therefore does not deserve the press attention and subsequent public alarm that has been created.
This paper lists all known intoxication attempts, including the famous Markov assassination.
Gweihir • June 14, 2013 8:43 AM
Au contraiere. With the successful attempts of the US government to decouple fear created by (potential) terrorist acts from the actual potential damage, Ricin is ideal: It likely does no to very moderate damage, yet people will be terribly afraid in large masses, because they do not get it. As terrorism is not about doing damage, but about creating fear, and due to the perfect alignment of contemporary terrorist goals and US administration goals (destroy US population freedom and thereby US society), I expect we will see Ricin “terrorism” in the future, either something genuine, or something staged by the FBI. After all, the FBI cannot stage bombings with non-functional explosives forever, people will just get tired of that and not generate the indented amount of fear anymore. But Ricin is nicely exotic and diabolic-feeling and when the first actually competent journalist digs up this paper it will already be too late.