He is known for inventions such as " the gas flow a-particle proportional counter for measuring plutonium yields in the presence of high intensity fission products ", and the " neutron monitor ".
32.
As part of the university faculty, Simpson was able to invent and patent a " gas flow a-particle proportional counter for measuring plutonium yields in the presence of high intensity fission products ".
33.
The Chamaeleon I dark cloud was observed with the Imaging Proportional Counter ( IPC ) on board the Einstein Observatory for 2.5 h on January 23 24, 1981, identifying some 22 X-ray sources.
34.
Energy Range : 0.1 keV-60 keV . Gas Scintillator Proportional Counter : 10 units of 80 cm 2 each, FOV ~ 3deg ( FWHM ), 2-60 keV . Transient Source Monitor : 2-10 keV.
35.
John Alexander Simpson is known for inventions such as the " gas flow ?-particle proportional counter for measuring plutonium yields in the presence of high intensity fission products ", and a " neutron monitor ".
36.
Tenma carried GSFC detectors which had an improved energy resolution ( by a factor of 2 ) compared to proportional counters and performed the first sensitive measurements of the iron spectral region for many astronomical objects.
37.
Charge amplifiers are also used extensively in instruments measuring ionizing radiation, such as the proportional counter or the scintillation counter, where the energy of each pulse of detected radiation due to an ionising event must be measured.
38.
This mode of operation is referred to as " current " mode, meaning that the output signal is a continuous current, and not a pulse output as in the cases of the Geiger-M�ller tube or the proportional counter.
39.
The energy channel resolution and timing resolution could be selected by commands sent to the spacecraft . The proportional counter could have up to 9 channels with 0.5 s resolution; the NaI scintillator could have up to 16 channels and 0.00025 s resolution.
40.
In total 4, 580 PSPC ( Position Sensitive Proportional Counter ) and 4482 HRI fields were covered with observation times between ~ 2, 000 sec and ~ 1 Million sec . 700 Scientists ( PIs ) from 24 countries were involved in these pointed observations.
