TABLE 4
Ratios of α-Particle Absorbed Fractions in Skeletal Tissues of Lumbar Vertebra
| Energy (MeV) | 44-y male φ(TAM←TAM) | Absorbed fraction ratio | 44-y male φ(TBE←TAM) | Absorbed fraction ratio | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  | Average |  |  |  |  | Average | |||||||||||
| 3.0 | 9.90E−01 | 0.998 | 0.997 | 0.999 | 0.997 | 0.998 | 9.11E−03 | 1.177 | 0.997 | 1.125 | 1.261 | 1.140 | ||||||||
| 4.0 | 9.86E−01 | 0.997 | 0.996 | 0.998 | 0.996 | 0.997 | 1.23E−02 | 1.190 | 0.987 | 1.109 | 1.255 | 1.135 | ||||||||
| 5.0 | 9.80E−01 | 0.996 | 0.995 | 0.998 | 0.995 | 0.996 | 1.47E−02 | 1.183 | 0.983 | 1.094 | 1.245 | 1.126 | ||||||||
| 6.0 | 9.74E−01 | 0.995 | 0.993 | 0.997 | 0.993 | 0.995 | 1.68E−02 | 1.189 | 0.996 | 1.082 | 1.246 | 1.128 | ||||||||
| 7.0 | 9.67E−01 | 0.993 | 0.990 | 0.997 | 0.991 | 0.993 | 1.89E−02 | 1.191 | 1.013 | 1.074 | 1.251 | 1.132 | ||||||||
| 8.0 | 9.59E−01 | 0.992 | 0.989 | 0.996 | 0.989 | 0.991 | 2.07E−02 | 1.187 | 1.015 | 1.071 | 1.239 | 1.128 | ||||||||
| 9.0 | 9.50E−01 | 0.990 | 0.987 | 0.996 | 0.987 | 0.990 | 2.26E−02 | 1.178 | 1.041 | 1.060 | 1.234 | 1.128 | ||||||||
| 10.0 | 9.41E−01 | 0.988 | 0.984 | 0.996 | 0.985 | 0.988 | 2.41E−02 | 1.186 | 1.062 | 1.060 | 1.225 | 1.133 | ||||||||
| Average: | 0.994 | Average: | 1.131 | |||||||||||||||||
| Energy (MeV) | 44-y male φ(TAM←TBS) | Absorbed fraction ratio | 44-y male φ(TBE←TBS) | Absorbed fraction ratio | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  | Average |  |  |  |  | Average | |||||||||||
| 3.0 | 5.91E−02 | 1.013 | 1.010 | 1.001 | 1.012 | 1.009 | 4.42E−01 | 0.999 | 0.997 | 1.001 | 0.999 | 0.999 | ||||||||
| 4.0 | 1.46E−01 | 1.010 | 1.007 | 1.001 | 1.006 | 1.006 | 3.60E−01 | 0.986 | 0.987 | 0.998 | 0.992 | 0.991 | ||||||||
| 5.0 | 2.16E−01 | 0.998 | 0.996 | 0.993 | 0.997 | 0.996 | 2.93E−01 | 0.981 | 0.983 | 1.001 | 0.991 | 0.989 | ||||||||
| 6.0 | 2.63E−01 | 0.999 | 0.990 | 0.987 | 0.993 | 0.992 | 2.49E−01 | 0.982 | 0.996 | 1.012 | 1.001 | 0.998 | ||||||||
| 7.0 | 2.99E−01 | 0.996 | 0.990 | 0.984 | 0.990 | 0.990 | 2.10E−01 | 0.983 | 1.013 | 1.016 | 1.003 | 1.004 | ||||||||
| 8.0 | 3.30E−01 | 0.995 | 0.993 | 0.985 | 0.991 | 0.991 | 1.76E−01 | 0.986 | 1.015 | 1.016 | 1.010 | 1.007 | ||||||||
| 9.0 | 3.54E−01 | 0.993 | 0.997 | 0.985 | 0.993 | 0.992 | 1.57E−01 | 0.978 | 1.041 | 1.011 | 1.018 | 1.012 | ||||||||
| 10.0 | 3.76E−01 | 0.990 | 1.007 | 0.984 | 0.997 | 0.995 | 1.39E−01 | 0.977 | 1.062 | 1.021 | 1.041 | 1.025 | ||||||||
| Average: | 0.996 | Average: | 1.003 | |||||||||||||||||
| Energy (MeV) | 44-y male φ(TAM←TBV) | Absorbed fraction ratio | 44-y male φ(TBE←TBV) | Absorbed fraction ratio | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  | Average |  |  |  |  | Average | |||||||||||
| 3.0 | 9.75E−04 | 1.011 | 1.181 | 1.110 | 1.316 | 1.154 | 2.43E−02 | 0.983 | 1.155 | 1.073 | 1.234 | 1.111 | ||||||||
| 4.0 | 5.24E−03 | 0.986 | 1.139 | 1.068 | 1.231 | 1.106 | 3.42E−02 | 0.993 | 1.170 | 1.084 | 1.247 | 1.123 | ||||||||
| 5.0 | 1.36E−02 | 0.986 | 1.143 | 1.059 | 1.224 | 1.103 | 4.34E−02 | 0.984 | 1.149 | 1.066 | 1.227 | 1.106 | ||||||||
| 6.0 | 2.53E−02 | 0.995 | 1.162 | 1.077 | 1.242 | 1.119 | 5.10E−02 | 0.987 | 1.162 | 1.084 | 1.237 | 1.117 | ||||||||
| 7.0 | 3.97E−02 | 1.005 | 1.168 | 1.075 | 1.254 | 1.126 | 5.78E−02 | 0.989 | 1.157 | 1.079 | 1.237 | 1.116 | ||||||||
| 8.0 | 5.76E−02 | 0.996 | 1.156 | 1.064 | 1.238 | 1.113 | 6.31E−02 | 0.993 | 1.156 | 1.073 | 1.238 | 1.115 | ||||||||
| 9.0 | 7.74E−02 | 1.001 | 1.156 | 1.063 | 1.238 | 1.114 | 6.75E−02 | 0.992 | 1.152 | 1.074 | 1.232 | 1.112 | ||||||||
| 10.0 | 9.98E−02 | 0.999 | 1.149 | 1.057 | 1.225 | 1.108 | 7.10E−02 | 0.992 | 1.152 | 1.076 | 1.229 | 1.112 | ||||||||
| Average: | 1.118 | Average: | 1.114 | |||||||||||||||||
Comparisons are made between values using the skeletal microstructure of the Leeds 44-y male (44 M) reference subject and 4 other individuals of the Leeds studies: 25-y male (25 M), 55-y female (55 F), 70-y female (70 F), and 85-y female (85 F).