Strong decay gamma rays

Strong decay y-rays of multi-gamma calibration sources... 

Hadronic models deal with secondary electrons (first proposed by Dennison 1980) produced by the decay of collision/annihilation products (mainly 7r=b —> e ) of p-p (Colafrancesco Blasi 1998, Blasi Colafirancesco 1999) or x- X (e.g., Colafrancesco Mele 2001) interactions. The secondary electrons are produced in situ (thus avoiding to invoke re-acceleration) and require values 1 — 10, found to be more consistent with Faraday Rotation data. These models predict a substantial p/e ratio (like that observed in our Galaxy and in SNe remnants) and an extended modest gamma-ray emission with both hadronic and electronic signatures. The in-situ character of these models produce an extended emission both in space and in time (it is actually stationary) and a quite strong feedback on the ICM (Colafrancesco 1999, Miniafi et al. 2001). 

Thallium-201 is a radioisotope used to determine whether a person has heart disease (caused by narrowing of the arteries to the heart). This isotope decays by electron capture and emits x rays and gamma rays, which can be nsed to obtain images similar to those obtained from technetium-99m (Figure 21.13). Thallium-201 injected into the blood binds particularly strongly to heart muscle. Diagnosis of heart disease depends on the fact that only tissue that receives sufficient blood flow binds thallium-201. When someone exercises strenuously, some part of the person s heart tissue may not receive sufficient blood because of narrowed arteries. These areas do not bind thallium-201 and show up on an image as dark spots. 

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