International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

International Tables for Crystallography (2006). Vol. G, ch. 3.3, p. 126

Section 3.3.8.1. Single pulse-counting detectors

B. H. Tobya*

aNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA
Correspondence e-mail: brian.toby@nist.gov

3.3.8.1. Single pulse-counting detectors

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In the most common measurement method, where a single pulse-counting detector is scanned over a range of [2\theta], the _pd_meas_* entries (see Section 3.3.4.4[link]) will be of the form shown in Example 3.3.8.1[link]. If the data were scanned using a variable step size, the observations might be given as shown in Example 3.3.8.2[link]. Note that when _pd_meas_counts_* is used, the values given must be counts, so that the standard uncertainty will be the square root of the intensity values. This means that the intensity values must not be scaled, for example if the values were counts per second; otherwise the statistical uncertainty estimates will be incorrect.

Example 3.3.8.1. Measurements from a single pulse-counting detector with constant-step scan.

[Scheme scheme27]

Example 3.3.8.2. Measurements from a single pulse-counting detector with variable-step scan.

[Scheme scheme28]








































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