A single occasion on which either a PATIENT is positioned and exposed to ionizing radiation or ionizing radiation is released for checking, calibration, etc, when no PATIENT is present. Exposures comprise:

a.	Treatment exposure
b.	Check film
c.	Treatment exposure and check film (both occur simultaneously)
d.	Exposure for calibration and quality control (patient not present)

HEALTH CARE PROVIDERS must record the number of 'treatment exposures and check films' for each type of treatment machine. When a treatment exposure and check film occur simultaneously they should be counted as one exposure. HEALTH CARE PROVIDERS may also wish to record the number of exposures for calibration and quality control.

It should be noted that:

a.	If a machine switches itself off during the exposure and it can be restarted immediately from the control panel, this constitutes one exposure
b.	If a machine switches itself off during the exposure and before being restarted the radiographer has to enter the room to re-adjust the equipment, this should be counted as two exposures
c.	If a patient becomes distressed during an exposure necessitating turning off the machine and the radiographer has to enter the room before re-starting, this should be counted as two exposures. For total body radiation, a long exposure may be required which should be identified as such. For reporting purposes these should be counted as 20 exposures for each hour of the procedure

This class is also known by these names:

Context	Alias
plural	EXPOSURES