Obsidian use in the mosaic of the St. Juvenal church, Narni (Italy): chemical characterization and origin

Heritage Science

Table 4 Nuclear data (radioisotope from (n,γ) reaction, cross section, half-life, peak energy) and limit of detection of the elements investigated in this study (a: calculated according to[33] and expressed as ppm; h: hour; d: day; y: year)

Element	Product nuclide	Thermal cross section (barn)	Half life		γ-Ray used (keV)	LOD^a(ppm)
As	⁷⁶As	4.3	26.3	h	559.2	0.008
Ba	¹³¹Ba	13.5	11.8	d	496.3	10
Ce	¹⁴¹Ce	0.57	32.38	d	145.4	0.01
Co	⁶⁰Co	37.2	5.272	y	1332.5	0.0008
Cr	⁵¹Cr	15.9	27.7	d	320.0	0.09
Cs	¹³⁴Cs	29.0	2.062	y	795.7	0.003
Eu	¹⁵²Eu	5900	12.7	y	1408.8	0.0002
Fe	⁵⁹Fe	1.15	45.1	d	1099.2	5
Hf	¹⁸¹Hf	12.6	42.5	d	482.2	1
K	⁴²K	1.46	12.36	H	1524.7	260
La	¹⁴⁰La	9.0	40.27	h	1596.2	0.0005
Mo	⁹⁹Mo	0.45	2.76	d	141.0	1
Na	²⁴Na	0.53	15.02	h	1368.6	2
Nd	¹⁴⁷Nd	1.3	11.06	d	531.0	10
Rb	⁸⁶Rb	72.1	18.66	d	1076.7	0.4
Sb	¹²²Sb	6.25	2.70	d	564.0	0.01
Sc	⁴⁶Sc	26.5	83.85	d	889.2	0.0008
Se	⁷⁵Se	51.8	120.4	d	246.6	0.02
Sm	¹⁵³Sm	206	1948	y	103.1	0.001
Ta	¹⁸²Ta	21.0	115	d	1221.3	0.5
Th	²³³Pa	7.40	27.4	d	311.8	0.2
U	²³⁹Np	2.70	2.35	d	277.6	0.2
W	¹⁸⁷W	37.8	23.9	h	687.7	0.1
Yb	¹⁷⁵Yb	65	4.19	d	396.1	2
Zn	⁶⁵Zn	0.78	243.8	d	1115.5	0.04