1047 / 1778
Amount of Radiation
ICRU report 38. 1985
Source strength
x
Dwell Time [s]
All positions
TRAK
[Gy]
ICRU/GEC ESTRO Report 89. 2016
Total Reference Air Kerma (TRAK)
KERMA:
K
inetic
E
nergy
R
eleased
per unit
MA
ss
1 m
At 1 m:
Reference Air Kerma Rate
[Gy/s]
• Corresponds to historical quantity
“mg
h of Radium”
• 1mg
h = 7.2
Gy @ 1m
• Physical parameter (not directly associated with effects)
• Extensive experience
• Comparison of treatments
• within & between institutions
Level 1
Level 2
Level 3