Uranium and Thorium Resources

Uraniumand ThoriumResources. Table 1 The main properties of geoneutrinos

Decay	Q (MeV)	τ _½ (10⁹ year)	E_max (MeV)	ε_H (W/kg)	\( \,{\epsilon_{{{{\bar{\nu }}_e}}}} \) (kg⁻¹ s⁻¹)
²³⁸U → ²⁰⁶Pb + 8 ⁴He + 6 e + 6 \( \,{\bar{\nu }_e} \)	51.7	4.47	3.26	0.95 × 10⁻⁴	7.41 × 10⁷
²³²Th → ²⁰⁸Pb + 6 ⁴He + 4 e + 4 \( \,{\bar{\nu }_e} \)	42.7	14.0	2.25	0.27 × 10⁻⁴	1.63 × 10⁷
⁴⁰ K → ⁴⁰Ca + e + \( \,{\bar{\nu }_e} \)	1.32	1.28	1.31	0.36 × 10⁻⁸	2.69 × 10⁴

\( {\bar{\nu }_e} \) denotes electron antineutrinos
where:
Q is the energy release for the overall decay chain
τ _½ is the half-life of the parent isotope
E_max is the maximum antineutrino energy in the decay chain
ε_H is the heating rate, per kg of the parent isotope
\( {\epsilon_{{{{\bar{\nu }}_e}}}} \) is the electron antineutrino source rate, per kg of the parent isotope