The tube chart that proves that Nanox is a fraud

Nanox team does not (or pretends not to) understand basic x-ray physics and engineering.  Its "technology" webpage and white paper are full of false, nonsensical, and self-contradictory statements.

Probably the single best example is the chart illustrating the supposed superiority of Nanox "core technology" - a novel chip-based cathode incorporated in a novel x-ray tube (see page 55, annual report).  

the chart, with enhanced saturation and added 42MW label

The chart is prominent on the technology webpage and in the white paper, where it is labeled "Hight [sic] Voltage independence" (Figure 9).  The chart title "T-35 Gate-2 HV/Ia independence" is not explained anywhere, but apparently refers to a Nanox Tube with diameters of 35 mm, utilizing a gate version #2 (as supposed to version #1?), and showing the independence between the tube (high) voltage and the tube (or anode) current (Ia).

Nanox T-35  tube that needs 42MW of power

The chart is supposed to demonstrate that Nanox cathode can enable "specific current irrespective of the anode ‎voltage."

But the chart is completely non-sensical, for at least four different reasons. 

1. The current scale is simply wrong.

Nanox does not know how to write numbers using simple scientific or engineering notation.  Jeremy Rutman is more diplomatic when he states: 

we note that whoever produced this graph forgot to use a negative exponent for his/her current units.

The vertical (current) scale in the chart goes like this: 0A, 2,000A, 4,000A, 6,000A, 8,000A, 100A, 120A.  Note that the tube current in the most powerful x-ray tubes in medical diagnostic devices is less than 1A, and notice the sharp drop-off after 8,000A.

If we take the point on the Ia (tube current) line at about 6kV (or 6,000V) tube voltage, the current is about 7.0E+03A (or 7,000 A), which corresponds to power requirement of about 42 megawatts (42,000,000 W) to power just one Nanox tube.  That is the power output from the massive generator of a small power plant:

a 40MW generator

a modern 40MW power plant 

2. The tube voltage is too low

The tube voltage on the chart does not go above 30kV.  If Nanox cathode (and tube) can only withstand 30 kV tube voltage, then the tube cannot be used in diagnostic medical devices, except to perform mammography.  Nanox own technical paper states in the section with the chart:

Typical kV in radiography range from 40-120kV and 22-49kV in mammography

The problem is that a mammography tube needs to withstand currents up to 100mA, while the chart, even with  a "fixed" scale where + is replaced with -, shows that Nanox tube can do no more than 1.1E-02A, or 11mA (unclear for what fraction of a second).

Moreover, neither the ugly Nanox.Cart nor the fancy-but-fake Nanox.Arc devices can do mammography due to their design, and Nanox removed the link to the easter-egg mammography concept device from its webpage.  

3. The chart demonstrates nothing

The chart is clearly using made-up data rather than actual readings.  That is not surprising, as Nanox cannot manufacture the proposed chip (has no access to facilities to do so commercially) or assemble the proposed (ceramic) tubes.  Moreover, even if everything was ok with the chart, it still shows nothing special about Nanox cathode or tube.  Most modern x-ray sources are required and designed to maintain independent control of tube voltage and tube current, that is "HV/Ia Independence."

4. Energy is not measured in volts, and current is not power

The description of the chart on the webpage even shows ignorance of the difference between energy and tension and how each is measured:

The Nanox gate electrode practically "ejects" the electrons from the ‎cathode and controls the amount of X-ray radiation, enabling independent control of ‎the X-ray current (mA tube current) and the energy (kV) that is set at the Anode. ‎

While there is a relationship between the x-ray energy and the tube voltage, energy is not set in kV - tension (or voltage or potential difference) is.

Elsewhere on the tech page, Nanox claims that with its cathode technology 

the current's power is independent of ‎the voltage

But the current's power is very much dependent on voltage - in fact, power is current times voltage.

Update July 1, 2021:  The 510k summary shows that the "Nanox tube" described in the submission can't do more than 2 mA and it can do it only at 40 kVp tube voltage, confirming the tube chart in the white paper is complete fake and fraudulent. 

Update October 9, 2021:  The fraudulent chart is still present in the "updated" white paper (updated in August only with the new Nanox logo).  Even replacing + with -, the chart would still show 11mA, or more than 5x the value in the 510K summary.