caa a22 4500 397502915 CHVBK 20180308164537.0 cr unu---uuuuu 161202e19950801xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082782 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082782 Variance-Covariance Measurements in Photon Beams for Simulated Nanometre Objects [Elektronische Daten] [J.E. Grindborg, G. Samuelson, L. Lindborg] The dose mean lineal energy yD, has been measured with the variance and the variance-covariance method for simulated object diameters down to 6 nm in photon beams. The measurements were made both in a conventional X ray beam (100 kV and a HVL of 0.14 mm Cu) and in a 60Co gamma ray beam. The measurements were made with electrometers designed to have low electronic noise. For small simulated object diameters the electronic noise and the variance from the secondary emitted electrons (SEE variance) increase in importance. In the present investigation those variances start to dominate over the variance from the ionisation of the gas (microdosimetric variance) at about 20 nm. Radiation Protection Dosimetry Grindborg J.E. aut Samuelson G. aut Lindborg L. aut Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 193-198 0144-8420 61:1-3<193 1995 61 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082782 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082782 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grindborg J.E. aut NATIONALLICENCE 700 1- Samuelson G. aut NATIONALLICENCE 700 1- Lindborg L. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 193-198 0144-8420 61:1-3<193 1995 61 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