the difference between the toxicological reference value and the oral reference dose during chemical risk assessment
You might want to look at NIH NLM's ToxTutor, e.g., the Dose and Dose-Response, Toxic Effects, Risk Assessment, and Exposure Standards and Guidelines sections. See: https://toxtutor.nlm.nih.gov/
Toxicity Reference Value (TRV) is a broad term encompassing exposure through various routes (e.g. inhalation, oral). It's subypes could be OEL/RfC/TC/TCA (inhalation route), oral (ADE)/PDE, MRL etc. The sub-types are also named differently in different parts of the world.
TRV: Toxicity reference values are established for a route-specific critical health effect to a given chemical exposure over time (e.g., acute, sub-chronic or chronic) and can set the upper margin of exposure to a given chemical for the general population; this represents a level below which adverse health effects are unlikely to occur.
Reference: https://www.fda.gov/media/124680/download
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