C3243837_HL7V3.0

**Description:**The interaction of entities whereupon a subject entity is brought into proximity to a physical, chemical or biological agent. This includes intended exposure (e.g. administering a drug product) as well as accidental or environmental exposure. (Note: This class deals only with proximity and not the effectiveness of the exposure, i.e. not all exposed will suffer actual harm or benefit.)

**Examples:**Exposure to radiation, drug administration, inhalation of peanut aerosol or viral particles.

The action of coming into sufficient physical proximity to allow physical or chemical interaction. Examples include: exposure to radiation, inhalation of peanut aerosol or viral particles. This includes intended exposure (e.g. administering a drug product) as well as accidental or environmental exposure. Actual vs. potential exposure can be differentiated using Act.uncertaintyCode.

* The ***exposed entity*** is the entity of interest that is the recipient of the exposure and potentially affected. This is conveyed through the subject (SBJ) Participation. * An entity that has carried the agent transmitted in the exposure is the \'***exposure source***\' (EXSRC). For example: * a person or animal who carried an infectious disease and interacts (EXSRC) with another person or animal (SBJ) transmitting the disease agent; or * a place or other environment (EXSRC) and a person or animal (SBJ) who is exposed in the presence of this environment. * When it is unknown whether a participating entity is the source of the agent (EXSRC) or the target of the transmission (SBJ), also known as \'***exposure contact***\', the \'participant\' (PART) is used. * The substance to which the subject is exposed that carries the exposure agent or the chemical substance of interest itself, participates as a \'consumable\' (CSM). There are at least two configurations: (a) the player of the Role that participates as CSM is the chemical or biological substance mixed or carried by the scoper-entity of the Role (e.g., ingredient role); or (b) the player of the Role that participates as CSM is a mixture known to contain the chemical, radiological or biological substance of interest. * The device specifically used to administer the substance is associated using the device (DEV) Participation. This may be a device intentionally used (such as applicator device) or it may be a thing that accidentally carried this substance; for instance, an infected needle or knife. The same entity may be related in the act as both EXSRC and DEV.