Question

How many alpha particles are emitted when thorium 234 changes to polonium 218?

Answer 1

Authors: F. E. CHUKREEV, V. E. MAKARENKO, M. J. MARTIN Citation:Nuclear Data Sheets 97,129 (2002)

Parent

Nucleus Parent

E(level) Parent

Jπ Parent

T1/2 Decay Mode GS-GS Q-value

(keV) Daughter

Nucleus Decay

Scheme ENSDF

file

238

92 U

2557.95 0+ 280 ns 6 IT: 97.4 4 %

238

92 U

Electrons:

Energy

(keV) Intensity

(%) Dose

( MeV/Bq-s )

Auger L 9.89 0.088 % 3 8.7E-6 3

Auger K 72.6 0.0067 % 9 4.8E-6 6

CE K 2442.4 20 0.22 % 0.0054

Gamma and X-ray radiation:

Energy

(keV) Intensity

(%) Dose

( MeV/Bq-s )

XR l 13.6 0.088 % 3 1.20E-5 5

XR kα2 94.654 0.0626 % 13 5.92E-5 13

XR kα1 98.434 0.1001 % 20 9.85E-5 20

XR kβ3 110.421 0.01254 % 24 1.38E-5 3

XR kβ1 111.298 0.0237 % 5 2.64E-5 5

XR kβ2 114.445 0.00921 % 18 1.054E-5 20

1879 32 % 8 0.60 16

2512.7 5 65 % 12 1.6 3

Gamma Coincidence Data:

For each gamma, the list of gammas in coincidence is given. If experimentally known, an estimate of the average time interval (in seconds) between both gammas is given

E(γ) Coincidence

44.915 635.18 (2.03E-10), 1879 (2.03E-10), 2512.7 (2.03E-10)

635.18 44.915 (2.03E-10), 1879

680.1 1879

1879 44.915 (2.03E-10), 635.18, 680.1

2512.7 44.915 (2.03E-10)