Table 1.

Age-specific k-factors (mSv mGy⁻¹ cm⁻¹) for 0-, 1-, 5-, 10- and 15-y-old, and adult ICRP reference phantoms for eight different scan types based on head and body CTDI phantoms. For the chest and pelvis scans where the effective doses based on the ICRP 60 and 103 tissue weighting factors are significantly different, 60 and 103 were added in the parenthesis for the scan types. The k-factors for other scan types are based on ICRP 103.

Scan region	0-y-old		1-y-old		5-y-old		10-y-old		15-y-old		Adult
	Head	Body	Head	Body	Head	Body	Head	Body	Head	Body	Head	Body
Head and neck	0.014		0.009		0.007		0.005		0.004		0.003
Head	0.009		0.006		0.004		0.003		0.002		0.002
Neck	0.023		0.013		0.009		0.007		0.005		0.005
Chest (103)	0.051	0.099	0.033	0.064	0.024	0.047	0.017	0.033	0.012	0.024	0.011	0.021
Chest (60)	0.045	0.087	0.029	0.057	0.021	0.041	0.015	0.028	0.011	0.021	0.009	0.018
AP	0.047	0.092	0.031	0.060	0.022	0.043	0.014	0.028	0.011	0.022	0.009	0.018
CAP	0.044	0.086	0.029	0.056	0.021	0.041	0.014	0.028	0.011	0.021	0.009	0.018
Abdomen	0.045	0.088	0.032	0.063	0.022	0.043	0.017	0.032	0.014	0.027	0.011	0.022
Pelvis (103)	0.028	0.054	0.021	0.041	0.015	0.028	0.009	0.017	0.008	0.015	0.006	0.011
Pelvis (60)	0.036	0.069	0.027	0.053	0.019	0.038	0.012	0.023	0.010	0.020	0.007	0.014