Powder dictionary (pdCIF) version 1.0.1
A linear distance in millimetres corresponding to the location where an intensity measurement is made. Used for detectors where a distance measurement is made as a direct observable, such as from a microdensitometer trace from film or a strip chart recorder. This is an alternative to _pd_meas_2theta_scan, which should only be used for instruments that record intensities directly against 2\q. For instruments where the position scale is nonlinear, the data item _pd_meas_detector_id should be used to record positions. Calibration information, such as angle offsets or a function to convert this distance to a 2\q angle or d-space, should be supplied with the _pd_calib_ values. Do not confuse this with the instrument geometry descriptions given by _pd_instr_dist_.
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