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what's the maximum energy of electrons that 20cm of radium can block?

Input interpretation

kinetic energy of particle |  incident particle | e^- (electron) radiation absorber | radium thickness | 20 cm
kinetic energy of particle | incident particle | e^- (electron) radiation absorber | radium thickness | 20 cm

Result

655 GeV (gigaelectronvolts)
655 GeV (gigaelectronvolts)

Comparison as energy for 655 GeV

 ≈ 2.4 × initial per beam operating energy of the CERN Super Proton Synchrotron in 1981 ( ≈ 4.3×10^-8 J )
≈ 2.4 × initial per beam operating energy of the CERN Super Proton Synchrotron in 1981 ( ≈ 4.3×10^-8 J )
 ≈ 5.2 × mass-energy of a Higgs boson particle ( 1 m_H^0 c^2 )
≈ 5.2 × mass-energy of a Higgs boson particle ( 1 m_H^0 c^2 )
 ≈ 7 × mass-energy equivalent of a Z boson ( ≈ 1.5×10^-8 J )
≈ 7 × mass-energy equivalent of a Z boson ( ≈ 1.5×10^-8 J )

Comparison as kinetic energy for 655 GeV

 ≈ 0.66 × approximate kinetic energy of a flying mosquito ( ≈ 1.6×10^-7 J )
≈ 0.66 × approximate kinetic energy of a flying mosquito ( ≈ 1.6×10^-7 J )

Absorber material properties

atomic number (Z) | 88 atomic mass number (A) | 226 〈Z/A〉 | 0.3894 nuclear collision length (λ_T) | 116.9 g/cm^2 nuclear interaction length (λ_I) | 205.5 g/cm^2 radiation length (X_0) | 6.15 g/cm^2 minimum ionization (- dE/ dx |_ min) | 1.111 MeV/(g/cm^2) density | 5 g/cm^3 mean excitation energy | 826 eV Molière radius | 18.12 g/cm^2 pion collision length | 139.9 g/cm^2 pion interaction length | 231.8 g/cm^2 plasma energy | 40.21 eV
atomic number (Z) | 88 atomic mass number (A) | 226 〈Z/A〉 | 0.3894 nuclear collision length (λ_T) | 116.9 g/cm^2 nuclear interaction length (λ_I) | 205.5 g/cm^2 radiation length (X_0) | 6.15 g/cm^2 minimum ionization (- dE/ dx |_ min) | 1.111 MeV/(g/cm^2) density | 5 g/cm^3 mean excitation energy | 826 eV Molière radius | 18.12 g/cm^2 pion collision length | 139.9 g/cm^2 pion interaction length | 231.8 g/cm^2 plasma energy | 40.21 eV