PMID- 3561331
OWN - NLM
STAT- MEDLINE
DCOM- 19870514
LR  - 20170214
IS  - 0094-2405 (Print)
IS  - 0094-2405 (Linking)
VI  - 14
IP  - 1
DP  - 1987 Jan-Feb
TI  - Detection efficiency of a high-pressure gas scintillation proportional chamber.
PG  - 115-23
AB  - The detection efficiency of a high-pressure, gas scintillation proportional 
      chamber (GSPC), designed for medical imaging in the 30-150 keV energy range, has 
      been investigated through measurement and Monte Carlo simulation. Measurements 
      were conducted on a GSPC containing 4 atm of pure xenon separated from a 
      hexagonal array of seven ultraviolet-sensitive photomultiplier tubes by 
      1.27-cm-thick fused-silica windows. Experimental measurements of the photopeak 
      efficiency, fluorescence escape efficiency, and the energy collection efficiency 
      were obtained. Results were also obtained for different photon energies and 
      different values of temporal resolution. The measurements were compared with the 
      results obtained from a Monte Carlo simulation designed specifically for 
      investigating the imaging of low-energy photons (below 150 keV) with a gas-filled 
      detector. The simulation was used to estimate photopeak efficiency, fluorescence 
      escape efficiency, photopeak-to-fluorescence escape peak ratio, quantum 
      interaction efficiency, energy collection efficiency, and local energy collection 
      efficiency. The photopeak efficiency of the GSPC relative to that of a 3-in. 
      (7.62-cm)-thick sodium iodide crystal was measured to be 0.284 +/- 0.001 at 60 
      keV and 0.057 +/- 0.001 at 140 keV. Of the 60-keV photons incident upon the 
      detector, 70% +/- 4% interacted in the detector, with 28% +/- 1% being in the 
      photopeak, as estimated both by experimentation and through the simulation. The 
      maximum energy collection efficiency was found to be 65% at 60 keV, with 46% 
      being deposited within 0.2 cm of the initial photon interaction. The information 
      gained from this study is being used to design an optimized detector for use in 
      specialized nuclear medicine studies.
FAU - Fahey, F H
AU  - Fahey FH
FAU - Zimmerman, R E
AU  - Zimmerman RE
FAU - Judy, P F
AU  - Judy PF
FAU - Lanza, R C
AU  - Lanza RC
LA  - eng
GR  - R01 HL24496/HL/NHLBI NIH HHS/United States
PT  - Journal Article
PT  - Research Support, U.S. Gov't, P.H.S.
PL  - United States
TA  - Med Phys
JT  - Medical physics
JID - 0425746
RN  - 0 (Gases)
SB  - IM
MH  - Biophysical Phenomena
MH  - Biophysics
MH  - Gases
MH  - Humans
MH  - Monte Carlo Method
MH  - Pressure
MH  - Radionuclide Imaging/*instrumentation
EDAT- 1987/01/01 00:00
MHDA- 1987/01/01 00:01
CRDT- 1987/01/01 00:00
PHST- 1987/01/01 00:00 [pubmed]
PHST- 1987/01/01 00:01 [medline]
PHST- 1987/01/01 00:00 [entrez]
AID - 10.1118/1.596098 [doi]
PST - ppublish
SO  - Med Phys. 1987 Jan-Feb;14(1):115-23. doi: 10.1118/1.596098.