Ionizing Radiation Division

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Table VIII.6. ISO X-Ray Beam Quality Parameters Offered at NIST

Beam  
Code		 Additional Filtration a First HVL b Second HVL b
Al
(mm)		 Cu
(mm)		 Sn
(mm)		 Pb
(mm)		 Al
(mm)		 Cu
(mm)		 Al
(mm)		 Cu
(mm)
HK10         0.042   0.045  
HK20 0.15       0.128   0.170  
HK30 0.52       0.408   0.596  
HK60 3.19         0.079   0.113
HK100 3.90 0.15       0.296   0.465
HK200   1.15       1.669   2.447
HK250   1.60       2.463   3.37
HK280   3.06       3.493   4.089
HK300   2.51       3.474   4.205
WS60   0.3       0.179   0.206
WS80 c   0.529       0.337   0.44
WS110 c   2.0295       0.97   1.13
WS150 c     1.03     1.88   2.13
WS200 c     2.01     3.09   3.35
WS250 c     4.01     4.30   4.50
WS300 c     6.54     5.23   5.38
NS10 0.095       0.049   0.061  
NS15 0.49       0.153   0.167  
NS20 0.90       0.324   0.351  
NS25 2.04       0.691   0.762  
NS30 4.02       1.154   1.396  
NS40   0.21       0.082   0.094
NS60   0.6       0.241   0.271
NS80 c   2.0       0.59   0.62
NS100   5.0       1.14   1.24
NS120   4.99 1.04     1.76   1.84
NS150     2.50     2.41   2.57
NS200 c   2.04 2.98     4.09   4.20
NS250     2.01 2.97   5.34   5.40
NS300 c     2.99 4.99   6.17   6.30
LK10 0.30       0.061      
LK20 2.04       0.441      
LK30 3.98 0.18     1.492      
LK35   0.25     2.21      
LK55   1.19       0.260    
LK70 d   2.64       0.509    
LK100 d   0.52 2.0     1.27    
LK125   1.0 4.0     2.107   2.094
LK170   1.0 3.0 1.5   3.565   3.592
LK210   0.5 2.0 3.5   4.726   4.733
LK240   0.5 2.0 5.5   5.515   5.542
a The additional filtration does not include the inherent filtration. The inherent filtration is a combination of the filtration due to the monitor chamber plus 1 mm Be for beam codes LK10-LK30, NS10-NS30, HK10-HK30; for all other techniques the inherent filtration is adjusted to 4 mm Al.
b The HVL values were measured directly using the two new x-ray tubes installed in November of 2001 and May of 2002.
c Previous HVL values; need to be measured on the new MXR-321 tube.
d Might be redeveloped using the Wyckoff-Attix rather than the Ritz FAC.

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Online: October 27 1997   -   Last update: June 2003