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CERIUM-139

Nuclear-physical characteristics

Decay mode

Electron capture (100%)

Half-life

137,641 days

Basic energy of gamma
and X-rays, keV
(quantum yield, %)

KX 34,138 (77,53)
165,8575 (80)

Production

Production process:

lanthanum metal target radiation treatment by a cyclotron

Nuclear reactions:

139La (p, n) 139Ce

Reprocessing:

target dissolution, ion-exchange emission

Product characteristics

Chemical form

Ce(III) chloride in 0,5 M HCl, or
Ce(III) nitrate in 1,0 M HNO3

Specific activity

≥ 25 mBq/mg

Radionuclide purity

min. 99,8 %

Volumetric activity

≥ 1 mBq/ml

Minimum single-unit package

1 mBq

Maximum single-unit package

300 mBq


Scope of application
Production of standards and calibration sources for radiometric equipment, production of sources for X-ray radiometric analysis, application for various scientific research activities as a radioactive indicator.

DECAY CHART
Days Days
0 1 2 3 4 5 6 7 8 9
0 1,0000 0,9950 0,9900 0,9850 0,9801 0,9751 0,9702 0,9654 0,9605 0,9557
10 0,9509 0,9461 0,9414 0,9366 0,9319 0,9273 0,9226 0,9180 0,9134 0,9088
20 0,9042 0,8997 0,8951 0,8907 0,8862 0,8817 0,8773 0,8729 0,8685 0,8641
30 0,8598 0,8555 0,8512 0,8469 0,8427 0,8384 0,8342 0,8300 0,8259 0,8217
40 0,8176 0,8135 0,8094 0,8053 0,8013 0,7973 0,7933 0,7893 0,7853 0,7814
50 0,7774 0,7735 0,7697 0,7658 0,7619 0,7581 0,7543 0,7505 0,7468 0,7430
60 0,7393 0,7356 0,7319 0,7282 0,7245 0,7209 0,7173 0,7137 0,7101 0,7065
70 0,7030 0,6994 0,6959 0,6924 0,6890 0,6855 0,6821 0,6786 0,6752 0,6718
80 0,6685 0,6651 0,6618 0,6584 0,6551 0,6518 0,6486 0,6453 0,6421 0,6388
90 0,6356 0,6324 0,6293 0,6261 0,6230 0,6198 0,6167 0,6136 0,6105 0,6075
100 0,6044 0,6014 0,5984 0,5954 0,5924 0,5894 0,5864 0,5835 0,5806 0,5776
110 0,5747 0,5719 0,5690 0,5661 0,5633 0,5605 0,5576 0,5548 0,5521 0,5493
120 0,5465 0,5438 0,5410 0,5383 0,5356 0,5329 0,5303 0,5276 0,5249 0,5223
130 0,5197 0,5171 0,5145 0,5119 0,5093 0,5068 0,5042 0,5017 0,4992 0,4967
140 0,4942 0,4917 0,4892 0,4868 0,4843 0,4819 0,4795 0,4771 0,4747 0,4723
150 0,4699 0,4675 0,4652 0,4629 0,4605 0,4582 0,4559 0,4536 0,4514 0,4491
160 0,4468 0,4446 0,4424 0,4401 0,4379 0,4357 0,4335 0,4314 0,4292 0,4270
170 0,4249 0,4228 0,4206 0,4185 0,4164 0,4143 0,4122 0,4102 0,4081 0,4061
180 0,4040 0,4020 0,4000 0,3980 0,3960 0,3940 0,3920 0,3900 0,3881 0,3861
190 0,3842 0,3823 0,3803 0,3784 0,3765 0,3746 0,3728 0,3709 0,3690 0,3672