Atomic and nuclear properties of a-150 tissue-equivalent plastic

Quantity	Value	Units	Value	Units
<Z/A>	0.54903
Specific gravity	1.127	g cm-3
Mean excitation energy	65.1	eV
Minimum ionization	1.978	MeV g-1cm2	2.229	MeV cm-1
Nuclear collision length	57.5	g cm-2	50.99	cm
Nuclear interaction length	81.4	g cm-2	72.20	cm
Pion collision length	85.0	g cm-2	75.39	cm
Pion interaction length	113.3	g cm-2	100.6	cm
Radiation length	41.86	g cm-2	37.14	cm
Critical energy	90.49	MeV (for e-)	88.09	MeV (for e+)
Molière radius	9.81	g cm-2	8.704	cm
Plasma energy ℏωp	22.67	eV
Muon critical energy	1159.	GeV

Composition:

Elem	Z	Atomic frac*	Mass frac
H	1	1.00	0.101327
C	6	0.64	0.775501
N	7	0.02	0.035057
O	8	0.03	0.052316
F	9	0.01	0.017422
Ca	20	0.00	0.018378
* calculated from mass fraction data

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries