**5. Conclussion**

14 Gamma Radiation

Air mass energy transfer coeff. [10-3 m2 kg-1]

1.3038 0.084 0.035 2.70 0.048 0.024 0.08 1.3777 4.30 0.10 2.63 1.986 0.060 3.37 1.4016 1.31 0.05 2.62 0.613 0.027 1.04 1.4081 2.47 0.05 2.61 1.157 0.033 1.96 1.5093 2.26 0.05 2.57 1.118 0.033 1.90 1.5387 - - 2.56 - - - 1.5433 0.29 0.06 2.555 0.146 0.027 0.25 1.5833 0.76 0.05 2.54 0.390 0.027 0.66 1.5948 0.33 0.04 2.535 0.170 0.020 0.29 1.6055 0.33 0.05 2.53 0.171 0.027 0.29 1.6614 1.10 0.04 2.505 0.584 0.020 0.99 1.6841 0.22 0.0,04 2.495 0118 0.020 0.20 1.7298 2.91 0.11 2.48 1.592 0.060 2.70 1.7646 16.70 0.32 2.46 9.243 0.231 15.69 21.49 0.79 36.49

Air Kerma-rate const., [aGy m2 s-1 Bq-1] Yield to total [%]

Yield per decay

1 2 3 4 5 6

IV 1.8386 0.34 0.05 2.43 0.194 0.026 0.33

V 2.700 0.034 0.005 2.16 0.025 0.026 0.042

Total air-kerma rate constant: 58.9 2.4 100.0

of 226Ra radionuclide in equilibrium with its decay products (Ninkovic, 1987)

Table 4. Data for calculation and calculated partial, proup`s and total air kerma rate constant

2.770 0.028 0.004 2.14 0.021 0.043 0.036 2.788 0.0058 0.0010 2.135 0.001 0.019 0.02 2.885 0.0095 0.0010 2.11 0.007 0.014 0.012 2.922 0.0162 0.0030 2.10 0.001 0.0005 0.002 2.979 0.0162 0.0010 2.08 0.001 0.0002 0.002 3.000 0.0089 0.0010 2.075 0.001 0.0001 0.002 3.054 0.022 0.003 2.065 0.018 0.0.003 0.030 3.082 0.0047 0.00005 2.06 0.004 0.001 0.007 3.142 - - 2.05 - - - 0.08 0.01 0.14

1.8476 2.14 0.09 2.425 1.222 0.043 2.07 1.8735 0.20 0.03 2.415 0.115 0.019 0.20 1.8967 0,06 0.03 2.405 0.035 0.014 0.06 2.011 0.05 0.02 2.36 0.030 0.012 0.05 2.017 - - 2.355 - - - 2.119 1.24 0.02 2.325 0.779 0.020 1.32 2.2043 5.25 0.03 2.305 3.401 0.119 5.77 2.294 0.34 0.01 2.28 0.227 0.007 0.38 2.448 1.73 0.03 2.235 1.207 0.033 2.05 7.21 0.30 12.24

[%]

Group of lines

Energy [MeV]

> Presented process of recalculation the values for air kerma rate constants, for 35 of the most often used radionuclide in practice, was based on the newest appropriate decay data for every radionuclide and latest numerical data for mass energy-transfer coefficient. That is the reason why, according to the authors opinion, obtained values for listed in the table 1, are the most accurate data that can be found in the literature available at present.

> It has to be pointed out that to calculate the absorbed dose to soft tissue the air kerma rate has to be multiplied by the ratio of the mass energy-absorption coefficient of soft tissue to that of air, which can be taken as 1,11 between 2 and 0,1 MeV and drops to 1,04 at 0,02 MeV. Also, since the radiation-waiting factor for gamma rays and X rays is 1, by multiplying air kerma rate constants by a factor 1,11, the soft tissue-equivalent dose constant can be obtained.
