Index

Core dictionary version 3.0.14

_diffrn_standard.decay_percent

Name:
_diffrn_standard.decay_percent

Aliases:
_diffrn_standards_decay_%
_diffrn_standards.decay_%
_diffrn_standards_decay_percent

Definition:

   
     The percentage decrease in the mean of the intensities for the
     standard reflections at the start to the finish of the measurement
     process. This value affords a measure of the overall decay in
     crystal quality during measurement. Negative values only occur in
     exceptional instances where the final intensities are greater than
     the initial ones.  If no measurable decay has occurred, the
     standard uncertainty should be quoted to indicate the maximum
     possible value the decay might have.  A range of 3 standard
     uncertainties is considered possible.  Thus 0.0(1) would indicate
     a decay of less than 0.3% or an enhancement of less than 0.3%.

Examples:

0.5(1)

represents a decay between 0.2% and 0.8%

-1(1)

change in standards between 2% decay and 4% rise

0.0(2)

change in standards between 0.6% decay and 0.6% rise.

Type: Real

Units: none

The permitted range is -infinity → 100

Category:
diffrn_standard