Matches in SemOpenAlex for { <https://semopenalex.org/work/W303940175> ?p ?o ?g. }
Showing items 1 to 61 of
61
with 100 items per page.
- W303940175 abstract "Photomultiplier tubes (PMTs) of various types from four manufacturers were measured to determine their gain drift characteristics. This was in turn related to retuning frequency in Anger cameras. A well stabilized light source illuminated sets of thirty-seven PMTs, simulating ideal steady-state conditions in an Anger camera. Anode outputs were sampled at six minute intervals for periods of up to three weeks using a multichannel data logger. Data were analyzed off line. It was found that PMT gains diverged form their initial values at a rate which decreased with time. The standard deviation of the gain changes, called drift, was plotted versus time. Drift was found to generally obey a power law function: D(%) = 0.16 x t/sup 0.6/ where t is the elapsed time in hours. In testing thousands of PMTs the authors occasionally found ''flyers'' with drift rates considerably larger than the average. The authors conclude that with sets of carefully selected PMTs the frequency of tuning would generally decrease as the tubes age. They also conclude that the presence of an occasional ''flyer'' PMT in a camera would undoubtedly necessitate more frequent tuning, in some cases on a weekly basis. These findings support the observed wide variation inmore » tuning frequency among Anger cameras without active PMT gain compensation.« less" @default.
- W303940175 created "2016-06-24" @default.
- W303940175 creator A5089692585 @default.
- W303940175 date "1984-01-01" @default.
- W303940175 modified "2023-09-23" @default.
- W303940175 title "Approximation and noise errors of measured T/sub 1/ in NMR imaging" @default.
- W303940175 hasPublicationYear "1984" @default.
- W303940175 type Work @default.
- W303940175 sameAs 303940175 @default.
- W303940175 citedByCount "0" @default.
- W303940175 crossrefType "journal-article" @default.
- W303940175 hasAuthorship W303940175A5089692585 @default.
- W303940175 hasConcept C105795698 @default.
- W303940175 hasConcept C113879476 @default.
- W303940175 hasConcept C115961682 @default.
- W303940175 hasConcept C120665830 @default.
- W303940175 hasConcept C121332964 @default.
- W303940175 hasConcept C154945302 @default.
- W303940175 hasConcept C22679943 @default.
- W303940175 hasConcept C33923547 @default.
- W303940175 hasConcept C41008148 @default.
- W303940175 hasConcept C94915269 @default.
- W303940175 hasConcept C99498987 @default.
- W303940175 hasConceptScore W303940175C105795698 @default.
- W303940175 hasConceptScore W303940175C113879476 @default.
- W303940175 hasConceptScore W303940175C115961682 @default.
- W303940175 hasConceptScore W303940175C120665830 @default.
- W303940175 hasConceptScore W303940175C121332964 @default.
- W303940175 hasConceptScore W303940175C154945302 @default.
- W303940175 hasConceptScore W303940175C22679943 @default.
- W303940175 hasConceptScore W303940175C33923547 @default.
- W303940175 hasConceptScore W303940175C41008148 @default.
- W303940175 hasConceptScore W303940175C94915269 @default.
- W303940175 hasConceptScore W303940175C99498987 @default.
- W303940175 hasLocation W3039401751 @default.
- W303940175 hasOpenAccess W303940175 @default.
- W303940175 hasPrimaryLocation W3039401751 @default.
- W303940175 hasRelatedWork W1579458772 @default.
- W303940175 hasRelatedWork W1579654831 @default.
- W303940175 hasRelatedWork W1802600970 @default.
- W303940175 hasRelatedWork W190064434 @default.
- W303940175 hasRelatedWork W2006827606 @default.
- W303940175 hasRelatedWork W2007835787 @default.
- W303940175 hasRelatedWork W2014509314 @default.
- W303940175 hasRelatedWork W2020135384 @default.
- W303940175 hasRelatedWork W2046538320 @default.
- W303940175 hasRelatedWork W2080151832 @default.
- W303940175 hasRelatedWork W2085933505 @default.
- W303940175 hasRelatedWork W2128105572 @default.
- W303940175 hasRelatedWork W2145506256 @default.
- W303940175 hasRelatedWork W2164763678 @default.
- W303940175 hasRelatedWork W2171687829 @default.
- W303940175 hasRelatedWork W2195129264 @default.
- W303940175 hasRelatedWork W2404470801 @default.
- W303940175 hasRelatedWork W2775239423 @default.
- W303940175 hasRelatedWork W2777560034 @default.
- W303940175 hasRelatedWork W2868974583 @default.
- W303940175 isParatext "false" @default.
- W303940175 isRetracted "false" @default.
- W303940175 magId "303940175" @default.
- W303940175 workType "article" @default.