7.9 The "standard engineer" of mass 70kg contains a range of elements, with potassium being the eighth most abundant element at 0.20% of his/her body mass. Of this potassium, the radioactive isotope, 40K, is only 0.0117%, and undergoes nuclear decay with a half-life of 1.26109 years. The 40K liberates particles (electrons) with 1.32MeV kinetic energy. Calculate the number of particles liberated per minute by the standard engineer. 7.9 The "standard engineer" of mass 70kg contains a range of elements, with potassium being the eighth most abundant element at 0.20% of his/her body mass. Of this potassium, the radioactive isotope, 40K, is only 0.0117%, and undergoes nuclear decay with a half-life of 1.26109 years. The 40K liberates particles (electrons) with 1.32MeV kinetic energy. Calculate the number of particles liberated per minute by the standard engineer