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A Few Significant Facts to be Kept in ind in
Considering the Possible Effects of Radium and
Nesotnorium on the Suman ore nism.
1. Nesotiorium dec ya 25 Muss 3. rapid 33 radium and conse-
,uently in its pure state, weight for wei sht, its activity would
greatly exceed that of radium. However, the unntity of meso-
therium 13 not expressed in milligrams by weight, but it is
rated in terms of radium, thus the activity of two compounds
compared Dear the same ratio no the values assigned to the
rations.
2. Althougă meso nor un itself is rayless, its first product,
which 1s rapidly formed after mesothorium has been separated,
gives powerful beth and SAMUS radiations. Comiequently, in the
comercial production of nesothoriun the operator must protect
hinself against these penetrating radiations. This 13 not so
necessayin the commercial production of radium 38 the product
giving rise so the penetrating gasun radiation Ta C) 1a formed
rather slowly.
3. The half value period of radium is 1580 years Thile that
of mesothorium is 6.7 years. This 1. of impotance 1n consider-
ing the acount tive effects of interial that ay 08 deposited
in the system.
4. In the deeny of radium #8 have 13 the first product. the
examation 1th a milf Seciod of 3.8 lyys, followed by the active
deposit of rapid change (RaA, RaB, RaC), and then the active
deposit of 6107 change (RaD, RaE, RaP). Radium D and E emit
soft bets rays and have half periods of 16.5 ears and 4.85 dggs
respectively. Rullua F or Polonium emits sloha rays and has
a half period of 136.5 days. In the case of mesothorium the
emanation has R half period of 54.5 seconds, which 16 followed
Th A, ij, Co C, comparable LO the active deposit of rapid change
in the radium series. The 18 followed by Thorium D (Th lead)
nion 18 Jt blo
It 18 important to note, that while there 18 enerated from
Radon 8 product of comperitively tong life cultins alpha rad-
intuon were 13 no similar product generated in the thorium
series.
5.The mage of an alpan particle from the to rium
series 13 5.6 00, while from the malium series it 18 6.34 сп.
H.H. Barker.
Physical Laboratory,
January 5, 1936
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"ocrText": "A Few Significant Facts to be Kept in ind in\nConsidering the Possible Effects of Radium and\nNesotnorium on the Suman ore nism.\n1. Nesotiorium dec ya 25 Muss 3. rapid 33 radium and conse-\n,uently in its pure state, weight for wei sht, its activity would\ngreatly exceed that of radium. However, the unntity of meso-\ntherium 13 not expressed in milligrams by weight, but it is\nrated in terms of radium, thus the activity of two compounds\ncompared Dear the same ratio no the values assigned to the\nrations.\n2. Althougă meso nor un itself is rayless, its first product,\nwhich 1s rapidly formed after mesothorium has been separated,\ngives powerful beth and SAMUS radiations. Comiequently, in the\ncomercial production of nesothoriun the operator must protect\nhinself against these penetrating radiations. This 13 not so\nnecessayin the commercial production of radium 38 the product\ngiving rise so the penetrating gasun radiation Ta C) 1a formed\nrather slowly.\n3. The half value period of radium is 1580 years Thile that\nof mesothorium is 6.7 years. This 1. of impotance 1n consider-\ning the acount tive effects of interial that ay 08 deposited\nin the system.\n4. In the deeny of radium #8 have 13 the first product. the\nexamation 1th a milf Seciod of 3.8 lyys, followed by the active\ndeposit of rapid change (RaA, RaB, RaC), and then the active\ndeposit of 6107 change (RaD, RaE, RaP). Radium D and E emit\nsoft bets rays and have half periods of 16.5 ears and 4.85 dggs\nrespectively. Rullua F or Polonium emits sloha rays and has\na half period of 136.5 days. In the case of mesothorium the\nemanation has R half period of 54.5 seconds, which 16 followed\nTh A, ij, Co C, comparable LO the active deposit of rapid change\nin the radium series. The 18 followed by Thorium D (Th lead)\nnion 18 Jt blo\nIt 18 important to note, that while there 18 enerated from\nRadon 8 product of comperitively tong life cultins alpha rad-\nintuon were 13 no similar product generated in the thorium\nseries.\n5.The mage of an alpan particle from the to rium\nseries 13 5.6 00, while from the malium series it 18 6.34 сп.\nH.H. Barker.\nPhysical Laboratory,\nJanuary 5, 1936"
}