Figure 8.

Gamma spectra collected during the mission. (a) Ambient, not far from the sources. (b) In the region between the ¹³⁷Cs, ⁶⁰Co and ¹⁵²Eu sources. (c) In front of the ¹³⁷Cs and ⁶⁰Co sources, the position of the three gamma peak energies and their corresponding Compton shoulders are indicated. (d) In front of the ²⁴¹Am source, the position of the gamma peak energy is indicated. (e) In front of the ¹⁵²Eu source, the positions of the main gamma peak energies are indicated. (f) Ambient, far from the sources.