کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1886583 | 1043539 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photon W-value of dry air determined using a cryogenic radiometer combined with a multi-electrode ion chamber for soft X-rays
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
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![عکس صفحه اول مقاله: Photon W-value of dry air determined using a cryogenic radiometer combined with a multi-electrode ion chamber for soft X-rays Photon W-value of dry air determined using a cryogenic radiometer combined with a multi-electrode ion chamber for soft X-rays](/preview/png/1886583.png)
چکیده انگلیسی
The photon W-value of dry air in the energy range of 2.2-3.9Â keV has been measured with relative expanded uncertainty of 0.84% (coverage factor k=2). Monochromatized synchrotron radiation was used for both measurements of the radiant power by means of a cryogenic radiometer and of photoion currents for ion-pair production by means of a multi-electrode ion chamber technique. The evaluated dependence of the photon W-value for dry air is consistent with the previously reported data for electrons and seems to show a small change at the Ar 1s ionization threshold. These findings were well reproduced with a model calculation using atomic photoionization data. Mass attenuation coefficients for air have been observed in the present soft X-ray region with a small energy step, which are close to data previously reported.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 79, Issue 4, April 2010, Pages 397-404
Journal: Radiation Physics and Chemistry - Volume 79, Issue 4, April 2010, Pages 397-404
نویسندگان
M. Kato, I.H. Suzuki, A. Nohtomi, Y. Morishita, T. Kurosawa, N. Saito,