caa a22 4500 397502443 CHVBK 20180308164535.0 cr unu---uuuuu 161202e19950101xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082536 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082536 A Simple Test for X Ray Tube Filtration [Elektronische Daten] [R.E. Gallini, S. Belletti, V. Berna, U. Giugni, G. Prandelli] To determine the total filtration of an X ray beam the user measures the half-value layer (HVL). The HVL is one of the parameters to be checked regularly in a Quality Assurance programme. Its value is an index of the spectral quality of the X ray beam and its experimental measurement requires narrow beam geometry, a condition which is often difficult to achieve in practice. The beam quality, at fixed tube potential, is therefore better represented by the ratio between the tenth-value layer (TVL) and HVL measured in the same conditions. The present work shows the results of measurements of the TVL/HVL ratio under different conditions for different X ray equipment. This test has many advantages: its execution is quick and easy, it does not require sophisticated instrumentation, and it is unaffected by the measurement conditions. Radiation Protection Dosimetry Gallini R.E. aut Belletti S. aut Berna V. aut Giugni U. aut Prandelli G. aut Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 253-256 0144-8420 57:1-4<253 1995 57 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082536 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082536 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gallini R.E. aut NATIONALLICENCE 700 1- Belletti S. aut NATIONALLICENCE 700 1- Berna V. aut NATIONALLICENCE 700 1- Giugni U. aut NATIONALLICENCE 700 1- Prandelli G. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 253-256 0144-8420 57:1-4<253 1995 57 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford