X-ray technique measuring device
Реферат: 1509799 X-ray dosimetry SIEMENS AG 30 April 1975 [2 May 1974] 18086/75 Heading G1A An x-ray apparatus includes beam-area adjusting diaphragm plates 5, 6 and a measuring device e.g. an ionisation chamber 12 disposed in a housing 11 secured at the outlet of the diaphragm plate housing 4, the device having two concentric x-ray measurement fields disposed concentrically in a common plane with the smaller field 15 being so dimensioned that even with the narrowest beam focussing the field area is wholly occupied by x-rays whilst the larger field 16 is so dimensioned that even with the widest beam focussing no part of the beam falls outside the total area of the two fields 15, 16. Currents from these fields are converted into voltages by amplifiers 17, 18 respectively and the resulting signals obtained at terminals 27, 24 respectively are representative of incident dose and dose-area product of the incident x-ray field. Thus the dose rate representing signal from amplifier 17 is integrated at 25, 26 to yield the dose. The dose-rate signal is added at imput 21 to the signal from amplifier 18 which represents the area of the beam leaving the housing and the resultant signal is integrated at 22, 23. The signal from amplifier 17 also provides a measure of exposure time on timer 29. A signal from ionisation chamber 9 disables the x-ray tube 2 when suffucient radiation has passed to the x-ray film cassette 10.
Method of producing phantom for determining information carrying capability of x-ray techniques
Номер патента: SU950319A1. Автор: Александр Сергеевич Языков,Федор Федорович Теличко,Юрий Иванович Зимомря,Анастасия Федоровна Самодай. Владелец: Ужгородский Государственный Университет. Дата публикации: 1982-08-15.