The very low energy events are due to g - rays and electronic noise. The binding energy of the deuteron is released in the form of a 2.223 MeV g - ray. Because of the higher isotopic abundance of 115 In , and its larger cross section, the predominant radioactive isotope formed is 116 In and isomeric states. Simplified decay schemes for indium isotopes. When a very thin sample is irradiated, the rate of activation is directly proportional to the neutron flux.
Thick samples perturb the neutron flux and depress the rate of activation.
While any sample is being activated, it is also decaying. Thus we have two competing processes that determine the absolute value of the radioactivity of the sample at any point in time. A Canberra Model 2006 Charge-Sensitive preamplifier provides the interface between the counter tube and the main linear shaping amplifier. Block diagram of BF 3 Proportional Counter electronics. Block diagram of GeLi detector electronics.