Table 1.

Hit factors for ²³⁷Np, ²³⁹Pu and ²⁴¹Am alpha particles in bone lining cell nuclei

Adapted from Polig et al. (1992)

Source geometry	Radionuclide
	237Np/226Ra	239Pu	241Am
Hit factor (10−2 cm2 Bq−1 day−1)
Surface source
Plane surface	4.00	4.12	4.13
Cylinder (30 µm diameter)	5.38	5.58	5.78
Hit factor (10−5 cm3 Bq−1 day−1)
Volume source
Plane surface	3.36	3.85	4.26
Cylinder (30 µm diameter)	4.67	5.40	6.32