Все, наверное, помнят страсти по излучению вообще и рентгену в частности от телевизоров и мониторов. Кактусы и вот это вот всё.
Меня еще в детстве бабушка, царствие ей небесное, постоянно пугала: не садись близко к экрану, там радиация!
И в принципе да, логично же - десятки киловольт есть, должен получаться какой-то рентген. Нормативы там всякие по рентгенбезопасности для кинескопов во всех странах имеются.
Однако, оказывается - сюрприз, сюрприз! - никому и никогда не удалось зафиксировать рентген от кинескопа на фоне нормального природного фона (пардон за каламбур). И на фоне пониженного не удалось тоже.
The X-ray emission measurements showed no
levels above instrumental background, which fluctuated between 0.16 and 0.7 mR/h. (The gross X-ray level readings ranged from 0.12 to 0.85 mR/h). The one unit which showed a momentary reading of 0.85 mR/h was found, on rechecking to read 0.20 mR/h. The momentary high reading was attributed to background fluctuation and the overall conclusion was that there was no measurable x-radiation.
In the 1977 NIOSH report^), reference is made to a 1977 survey of 67 VDTs, in the same
newspaper facility, by a major insurance company. The maximum instrument reading was 0.2 mR/h and, since the background ranged from 0.1 to 0.3 mR/h, the conclusion was that no measurable x-radiation was being emitted by the VDTs surveyed.
In 1979 Weiss and Petersen(2) of the Bell Telephone Laboratories published the results
of their study of electromagnetic radiation emitted from 11 units of 8 models of VDTs used
by the Bell System. Their study included measurements for RF and microwaves (over the frequency range 10 kHz to 18 GHz), X-rays and UV, IR and visible light (over a band of wavelengths from 350 to 600 nanometers).
As in the case of the 1977 NIOSH study, no ionizing radiation could be detected above the ambient background level.
Wolbarsht et al.'3) carried out precise measurements on one model of VDT, an IBM
Model 3277, for RF in the frequency range 10 kHz to 10 GHz, for UV, IR, and visible light over the wavelength range 0.2 to 10 micrometres, and for X-rays in the energy range 5 to 40 keV.
The significant difference between this study and previous ones was that the measurements
were made in the laboratory, with detection sensitivities greater than those possible under field conditions. Furthermore, measurements were also made with an overvoltage fault induced in the VDT to maximize the potential for radiation emissions.
Using a Nal(Tl) scintillation detector, Wolbarsht et al. set an upper limit on possible
X-ray emissions of 3 x 10-6 R/h. There was no significant difference in results between measurements made under normal and fault conditions of operation.
In Britain, the National Radiological Protection Board and Electrical Research Association Technology Limited carried out a study of VDTs
No X-ray emissions exceeding the level of natural background of ionizing radiation (approximately 10 prem/h) were found. This is about fifty times less than the level that would correspond to the maximum permitted emission level of 0.5 mR/h at 5 cm for household products in Britain.
Cox stressed that the measured values were far in excess of those to which the operator
would be exposed since the measurements were made at the surface of the VDTs and with brightness and contrast controls adjusted to maximum settings.
In 1980, Terrana et al.,(6) of the Institute of Occupational Health of the University of
Milan, measured 85 VDTo tor X-ray emissions. Again, no X-ray emissions above background
levels were detected.
Единичные сообщения 70-х не просто о зафиксированном рентгене, а о превышающем нормативы - скорее всего, либо просто ошибка, либо флуктуация фона, либо - что, по-моему, наиболее вероятно - некая наводка в газоразрядном счётчике от вполне себе неионизирующего излучения.