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In page Pentaerythritol tetranitrate:

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The chemical stability of PETN is of interest, because of the presence of PETN in aging weapons.[2] Neutron radiation degrades PETN, producing carbon dioxide and some pentaerythritol dinitrate and trinitrate. Gamma radiation increases the thermal decomposition sensitivity of PETN, lowers melting point by few degrees Celsius, and causes swelling of the samples. Like other nitrate esters, the primary degradation mechanism is the loss of nitrogen dioxide; this reaction is autocatalytic.[citation needed] Studies were performed on thermal decomposition of PETN.[3]