tokens: Where experimental data show that the threshold for SEGR , SEDR or SEB for ions is ³15 MeV×cm2 / mg , or proton or neutron data indicate that the energy threshold for proton / neutron SEGR , SEDR or SEB is ³ 150 MeV , it shall be assumed that the device has negligible probability of SEGR , SEDR or SEB respectively when operated in either a proton or neutron field when it is subjected to the operating conditions or the test and application .