Call us: +7 (484) 399-86-36
COBALT-57

Nuclear-physical characteristics

Decay mode

Electron capture (100%)

Half-life

271,74 days

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

KX 6,47 (55,41)
14,41 (9,16)
122,06 (85,6)
136,47 (10,68)

Production

Production process:

radiation treatment of an enriched nickel-58
target by a cyclotron

Nuclear reactions:

58Ni (p, 2p) 57Co
58Ni (p, pn) 57Ni β+ -> 57Co

Reprocessing:

target dissolution, ion-exchange emission

Product characteristics

Chemical form

Co(II) chloride in 0,1 M HCl

Specific activity

≥ 6500 mBq/mg

Radionuclide purity

min. 99,85 % (56Co + 58Co ≤ 0,15 %)

Volumetric activity

≥ 10 mBq/ml

Minimum single-unit package

1 mBq

Maximum single-unit package

2000 mBq


Scope of application
Production of standards and calibration sources for radiometric equipment, medical gamma cameras, production of sources for X-ray radiometric analysis and Moessbauer spectroscopy, application for various scientific research activities as a radioactive indicator. Vitamin B12 (albumen) marked by cobalt-57 radionuclide is used in diagnostic sets for anaemia studies.

DECAY CHART
Days Days
0 5 10 15 20 25 30 35 40 45
0 1,0000 0,9873 0,9748 0,9625 0,9503 0,9382 0,9263 0,9146 0,9030 0,8916
50 0,8803 0,8691 0,8581 0,8472 0,8365 0,8259 0,8154 0,8051 0,7949 0,7848
100 0,7749 0,7651 0,7554 0,7458 0,7364 0,7270 0,7178 0,7087 0,6997 0,6909
150 0,6821 0,6735 0,6650 0,6565 0,6482 0,6400 0,6319 0,6239 0,6160 0,6082
200 0,6005 0,5929 0,5853 0,5779 0,5706 0,5634 0,5562 0,5492 0,5422 0,5354
250 0,5286 0,5219 0,5153 0,5087 0,5023 0,4959 0,4896 0,4834 0,4773 0,4713
300 0,4653 0,4594 0,4536 0,4478 0,4422 0,4366 0,4310 0,4256 0,4202 0,4149
350 0,4096 0,4044 0,3993 0,3942 0,3892 0,3843 0,3794 0,3746 0,3699 0,3652
400 0,3606 0,3560 0,3515 0,3470 0,3426 0,3383 0,3340 0,3298 0,3256 0,3215
450 0,3174 0,3134 0,3094 0,3055 0,3016 0,2978 0,2940 0,2903 0,2866 0,2830
500 0,2794 0,2759 0,2724 0,2689 0,2655 0,2621 0,2588 0,2555 0,2523 0,2491
550 0,2459 0,2428 0,2398 0,2367 0,2337 0,2308 0,2278 0,2249 0,2221 0,2193
600 0,2165 0,2138 0,2111 0,2084 0,2057 0,2031 0,2006 0,1980 0,1955 0,1930
650 0,1906 0,1882 0,1858 0,1834 0,1811 0,1788 0,1765 0,1743 0,1721 0,1699
700 0,1678 0,1656 0,1635 0,1615 0,1594 0,1574 0,1554 0,1534 0,1515 0,1496
750 0,1477 0,1458 0,1440 0,1421 0,1403 0,1386 0,1368 0,1351 0,1334 0,1317
800 0,1300 0,1284 0,1267 0,1251 0,1235 0,1220 0,1204 0,1189 0,1174 0,1159
850 0,1144 0,1130 0,1116 0,1101 0,1088 0,1074 0,1060 0,1047 0,1033 0,1020