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Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 700
G21H, a halogen quenched Geiger Muller tube for Gamma radiation, Made in Romania, at the Institute of Atomic Physics . More details in the tube's passport, pictured below:
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Svetlana 0.0045BSM-1-Ni
Svetlana type designation system: (Power in kW - 0.0045)(Svetlana class - BSM-1)(Anode composition - Ni)
Directly-heated electron-impact diode, without focusing cup or grid. There are two Be windows at 180° on either side of the tube body for multi-task bench use.
Va = 10 - 30 kV. Vf = 0.75 - 2V If = 1 - 3A Ia must be adjusted by altering If so that Pin does not exceed 4.5W at the chosen anode voltage.
K𛼠for nickel is 7.47 keV. Anode over-voltage of 15 - 22keV (i.e. two to three times Kð›¼) is required for full K𛼠excitation.
Efficiency: Using Sprawls' efficiency approximation ( kV*Z*10E-06 ) nickel-anode photon production efficiency is 2.8*10E-03 at 10kV, rising to 8.4*10E-03 at the tube's 30kV maximum.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Svetlana 0.025BSV-7-Fe
Liquid-cooled 25W grid-controlled electron-impact micro-focus triode photon source with Fe anode and two opposing Be windows.
Va = 45 kV max Ia = 550 μA max Vf = 4 V max If = 2.5 ±0.1 A max Pin = 25W max
This triode device is designed to operate in constant voltage anode mode, with the anode current determined by the level of grid bias. Pulse modulation of the grid will produce corresponding pulses in photon output.
Characteristic energy spectrum of Fe anode. Fe Kα is at 6.4 keV
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Svetlana 0.3BSV-25-Ag
0.3BSV-25-Ag is a 300W silver anode electron-impact photon source of 'massive anode' design, which must be bolted to a water-cooled copper block. Four Be windows in two opposing pairs offer both a 0.07*2.0mm line (at 90° to the horizontal axis of the filament) and a spot parallel to the filament's axis.
Electrical connection to the filament is made by a high-temperature ceramic plug which mates with the socket at the bottom of the glass barrel.
Va - 60kV max Vf - 3V If - 3A Pin - 300W max
Kα for Ag is 22.15 keV corresponding to a wavelength of 5.59E-9 cm, where:
E = energy in ergs (1eV = 1.6 x 10E-12erg) h = Planck's Constant = 6.614 x 10E-27erg-sec c = velocity of light = 3 x 10E10cm/sec w = wavelength in cm (1Ã… = 1 x 10-8cm)
Then:
E =hc/w 22.15 E3*1.6 E-12 = (6.614E-27*3E10)/w W = 5.59E-9 cm or 0.559 Ã…
According to Svetlana, 4 keV is the lowest photon energy which can be transmitted through the Be windows in this design.
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What are the most interesting vacuum tubes in your collection?
