Count Rates
Count Rates Calculations
Here is the list of functions related to the count rates calculations that are provided by the "Neutron Scattering" XOP:
CountRate(N, T)
The CountRate function returns the count rate from the count N measured during time T . The count rate is defined by:
(where N is the number of neutrons and T is the counting time in seconds.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/b2b0c20679fcf5375253ae168aa5d275.png)
CountRateSDev(N, T)
The CountRateSDev function returns the standard deviation of the count rate from the count N measured during time T. The count rate standard deviation is defined by:
(where N is the number of neutrons and T is the counting time in seconds.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/29ee60c1da7a3b6699b67a5d5f269f53.png)
CountRateDDT(N, T, a, b)
The CountRateDDT function returns the count rate corrected for detector dead-time from the count N measured during time T. The corrected count rate is defined by:
(where N is the number of neutrons, T is the counting time in seconds and a, b are the first and second order correction coefficients expressed in seconds.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/49379b368477bffb79569f48e34e2f91.png)
CountRateDDTSDev(N, T, a, b , aSDev, bSDev)
The CountRateDDTSDev function returns the count rate standard deviation corrected for detector dead-time from the count N measured during time T. The corrected count rate standard deviation is defined by:
(where N is the number of neutrons, T is the counting time in seconds and a, b are the first and second order correction coefficients expressed in seconds. aSDev and bSDev are the standard deviations of a and b in seconds.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/6c78137e0212dc85a6cbc99edcf09a74.png)
CountRateMonitor(N, M)
The CountRateMonitor function returns the count rate from the count N and the monitor value M. The monitor count rate is defined by:
(where N and M are numbers of neutrons.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/198438820288a87ba38612db0d80ab51.png)
CountRateMonitorSDev(N, M)
The CountRateMonitorSDev function returns the standard deviation of the count rate from the count N and the monitor value M. The monitor count rate standard deviation is defined by:
(where N and M are numbers of neutrons.)
![](/fileadmin/user_upload/ILL/3_Users/Support_labs_infrastructure/Sample_Environment/Software/XOP_plugins_for_IGOR_Pro/Count_Rates/9be9255de6feb43dd2f345c989d79fc1.png)