When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy

Details When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..170..511w&link_type=abstract

AIP Conference Proceedings, Volume 170, pp. 511-517 (1988).

Computer Science

3

X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

Two operations common to spectroscopy data analysis are the accumulation of data and subtraction of background. These operations do not necessarily commute, and in some important situations accumulation followed by subtraction introduces serious systematic errors. This occurs when the background is strongly variable but must be estimated from data taken before or after the source observation. Then long data accumulations may cease to converge to a unique count rate, since none exists due to the variable background. Instead, the value obtained reflects the particular way the background was sampled. Because of dead time variations and data selection cuts the source and bacground sampling may differ, so that the expectation value of the difference of the source and background accumulations ceases to equal the true net source count rate. However, if the background is subtracted each source scan and only the net spectra accumulated, the effect is suppressed. We present simulations comparing the two methods, and briefly discuss practical means of subtracting background before the main accumulation is performed.

Affiliated with

Also associated with

No associations

Rating

When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and When and why background subtraction must be done before data accumulation in gamma-ray spectroscopy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-909169