SCIENTIFIC ABSTRACT FLEROV, D.I. - FLEROV, G.N.

• Document Type: CREST
• Collection: Scientific Abstracts
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• Document Creation Date: November 2, 2016
• Document Release Date: June 13, 2000
• Sequence Number: 7
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

POZDN M V. Mark Lvovich; ELEW"DI, red.; ~DWLI, L.S., red.
izd-va; GRECHISHCHEVA, V.I., tekhn. tid.
(Using plastic and synthetic materials for repairing timber
skidding tractors and logging motor vehicles]Primenenie
plasticheskikh mass i sintaticheakikh materialov pri remonte
trelevocbnykh traktorov i lesovoznykh avtomobilei. Moskva
Coslesbumisdat, 1962. 122 p. (MIRA 16:31
(Tractors-Kaintenance and repair)
(Motor vehicles-Maintendnes and repair)

RAYKHLIN, alman Tanfilov!cL 'dots.[deceased];GOKBM,Shlem Moiseyevich,
dots.; ZAYTSEV, Pavel Aiekse-,kevich, naucLin. raD., inzn.;
FLEROV D I., red.
[Basic ways of improving the maintenance and repair of lumber-
ing machines] Osnovnye puti sovershenstvovaniia remonta i
tekhnicheskogo obsluzhivaniia lesozagotovitellnykh mashin. Mo-
skva, Izd-vo I'Lesnaia proinyshlennostl," 1964. 132 p.
(MIRA 17:7)
1. Kafedra ekonomiki i organizatsii proizvodstva Urallskogo,
lesotekhnicheskogo, instituta (for Raykhlin). 2. Zaveduyusbchiy
kafedroy tyagovykh mashin Urallkogo lesotekhnicheskogo instituta
(for Gokhman). 3. Urallskiy lesotekhnicheskiy institut (for
Zaytsev).

VOUYNETS, O.N.; KOLOSKOV, A,V.; FI&ROV, G.B.; FRIKII-MAR, D.I.; SHILIN, N.L.
Formational delineation of Tertiary plutonic and volcanic-plutonic
formations in central Kamchatka. Dokl. AN SSSR 165 no.D153-155
N 165s (MIRA l8slO)
1. Institut vulkanologii Sibirskogo otdelaniya All SSSR. Submitted
March 10,, 1965.

VOLYNETS., O.N.; FIZROV, G.B.; FRIKH-KHAR, D.I.; SHILIN, N.L.
Evolution of the Tertiary Weous activity in the central ran*e
of Kamchatka. Geol. i geofiz. no.5t103-107 163. (MM 16:8)
1.. Kamchatskaya geologo-geofizicheakaya laboratoriya Sibirskogo
otdeleniya AN SSSR.
(Kamchatka-Geology, Structural)
(Kamchatka-Rocks, Igneous)

FLEROV, G.B.; KOLOSKOV, A.V.
potassjim metasomatites in the ultrabasic rocks of the central
range of Kamchatka. Izv. AN SSSR. Ser.Geol. 30 no.4:35-41 Ap
165. (mIRA l8:4)
1. Institut vulkanologii Sibirskogo otdeleniya AN SSSR, Petro-
pavlovsk-Kamchatskiy.

FLEROVt_'~.kl kand.tekhn.nauk
_ -_ - d~
Investigating a plane with merging traces. Trudy GPI 14 no.7.*7-12
158. - (MIRA 14:3)
(Geometry, Descriptive)

L ~~W PmZ~,;?~ _7WT Nb
ACCESSION NR: ALP4047420 S/CO89,'64/017/00-4/0310/0312
iMU,THORS: Flerov, G. N., 0qanesyan, Yu. Ts..- Lobanov, Yu. V., Kuz-
T.7 7. A-.; T~ I-, --v. P .
V ako----a, 5 -P.; Plotko, V. M.
TITLE: Synthesis and physical identification of the isotope of the
104th element with masa number 260
SOURICE: Atomnaya energiya, v. 17, no. 4, 1964, 310-312
TOPIC TAGS: transuranium element, half life, tipontaneous fission
ABSTRACT: In view of the fact that earlier estimates yielded a wide
260
range of values for the half-life of the isi~tqpe 1-0.4 'j",whereas ex
256
have shown that the element 102 a;--periences spontaneous
with a half-life of 1500 seconds, the c.ltho:s developed a
procedure fur indicating the spontaneous fissicn, for use in searches
Card 1/3

74,
L 1~218-A,5
ACCESSION NR: AP4047420
:for the 104th elements. The experiments were made with the internal
242-
am o a-- 00-cm -heavy-ibri-cyclotron The tarijet was Pu
and He
ions were used for bombardment, so that the investigated reaction
242 22 260
p1j. (Ne , 4n)104 . The equipment consisted esgentially of a
variable-speed belt conveyor to transport the reaction productq from
the target to the detectors. The frag-nent detf,ctors were silicate
znpln Ei t- e ~-i i ii s s e sTb e r: i s t r i b u t i
--:S
i 7ne reactions. The results of the a 'half-
j. Isec for -he 104 el--mrn-rir 7i,a;4 under
.-IS fissLc,n. ne correctnes-9
-he :or-ni of the e x c i r a ti co r~ 1 F'.
-a' ~-'-!,3 max.`inum, and the lack of an eff ---
r)ar--jcles and other tarqe~s F.
e v, A, N. Filipson, 1. A. Shelaye,~,, and the cyciotron crew for
reliable oparation of the cyclotron, S. M. Polikanov and Ye. D.
Card 2/3

L 13218-65
ACCESSION UR: AP4047420
aonetv for a discussion
tor Professor D. I. BI
o--F -At-onic Enerqv in the-USSR
ASSOCIATION: None
SUBMITTED: 29AuqG4
SUB CODE: NPPJZ-*
of the experimental results, and_OyYal direc-
cbintsev and the State Committee on the Use
for support of tl-i~~ work.' 'Driq. art.
ENCL: 00
HR REF SOV: 008
OTHER: 005
Card 3/3

_
T
Stone hieroglyphics of the history of the world. IUn.tek-h.
5 no.?:/+6,--48 JI 161. (MMA 15,1)
(Paleonthology--Juvenile literature)

ORLOV, Yu.A., otv. red.; GABUNIYA, L.K., red.; 7ROFHOV, B.A.,
red.; jq~,E ~011, ~.K., red.; YAIJOVSKAYA, E.M., red.
(Tertiary maimnals] Tretichnye mlekopitaiushchie. Moskva,
Izd-vo "Nauka," 1964. 57 p. (Its Doklady sovetskikh pa-
leontologov. Problema 8) (MIRA 17:6)
1. International Geological Congress, 22d, 1964.

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FLEROV G.-N.
S S S
"On the Spontaneous Separation of Uranium," Dok.. AN, 28, 4a. 6, 194o(Inst. for Research
in Radium of the USSR Acad. of Scholars,, member ~f) -ro 0 - J-0 1.

FLEROV G. X.
"Absorption of Slow Neutrono by Cadmium and Mercury," Uspekhi Fiz. I Nauk, 1941.

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FLEROV, G. N.
1- - a--' -- - - 1. - -: ", f
.,Spontaneous Fission of UraniUM)" Zhur. Fiz. 6, No. 1-2, 1942.

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Sci. 1955, 133-40(Fnb. 19-16)(FlIgI. tran5lation)-see C.'i.
50-3008f.
------- - ---

.1
"Possibilibies for Extendineg the Use of Radioactive Radiations in Oil
Prosieclu-In', and Oil-Field Develolment".
Report appearing in 1st Volume of "Session of The Acide!:q of O'ciences US3R
an the Peaceful Use of Atomic EnerU., 1-5 JulY 1955", Publishin-, Fouse of
Academy of Sciences U33R, 1955. ',-3 --F
SO: Sum 728, 28 Nov 1955.

V. Podcur*aYa- V- (,f
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Fig. 26. 5"
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cot" d with dola publMtd
RaF

15-57-7-9952
Translation from: Referativnyy zhurnal, Geologiya, 1957, Nr 7,
PP 176-177 (USSR)
AUTHORS: F1 Alekseyev, F. A.
TITLE: Use of Radioactive Radiation in Exploration and
Exploitation of Petroleum Deposits in the USSR
(Ispollzovaniye radioaktivnykh izlucheniy pri razvedke
i razrabotke neftyanykh mestorozhdeniy v S88R)
PERIODICAL: 4-Y Mezhdunar. neft. kongress. Vol 2, Moscow,
Gostoptekhizdat, 1956, pp 24-36
ABSTRACT: The advantages of radioactive electrical logging are
examined by the authors. The use of radiometry for
determining the position of the water-petroleum
contact in strata intersected by a cased well is
described. The problem is solved by methods of neutron
gamma electrical logging and of induced activity. In
Card 113 both cases the water-bearing stratum is distinguished

Use of Radioactive Radiation (Cont.) 15-57-7-9952
from the petroleum-bearing stratum by the different NaCl content of
the strata. The contacts can therefore be distinguished only where
the formation waters are sufficiently mineralized. The water-
bearing parts of the strata are marked by higher values on the curves
of neutronf-logging. The reason for this phenomenon lies in the
fact that the Cl readily traps the fast 2geutrons and gives off a
stable Y-radiation in the process. Na , which had a half-life of
15, is the index element for the method of induced activity. The
activation of the Al of rock and cement and of the Mn contained in
the casing pipes* make the utilization of the Cl activation imu
possible. The use of radioactive isotopes for study of the state of
wells (quality of cementing, inflows of liquids and movement of the
liquid outside the case) and ~or showing permeable zones in the
wells is considered. The radiometric instrument used in this work
is described. The instrument, which has discharge indicators, is
to be replaced by a more perfect one with luminescent indicators.
The results of the first tests in the use of radiometric survey for
Card 2/3

15-57-7-9952
Use of Radioactive Radiation (Cont.)
petroleum prospecting are set forth. A minimum of intensity of
Y-radiation, surrounded by an aureola of increased values of in-
tensity, was obtained on the petroleum field of the investigated
deposit.
Card 3/3 M. V. Zaporozhets

with M-al.'AUKHOV, V. A., "Interaction of ~cceleratod !,'Itrogerl Ions with
Bismuth Nuclei,"
with Pi'diF.'.1r-VICH, D. M. and SM.'CHINC-11A, A. 1M. , "Interaction of Accelerated
Nitrogen Ions with Bismuth Nuclei,"
with BARABOSHKIN, S. A., DRUIN, V. A., KIRAMAN, A. S., and POLIKAIJOV, S. M.
"Interaction between Nitrogen Nuclei and Heavy Elements Nuclei,"
with 13asrak, A. S., and Volkov, V. V., "Stripping Reaction Produced by
the Accelerated Nitrogen Ions on Some Nuclei,"
with FILIPPOVA, K. V., GM-LIT. Yu. B., GUSiWA, L. I., 62(ASOYEDOV, B. F.,
and TARANTIN, N. I., 111-lass Distribution of Fission Fragments Formated. by
I
"itrogen Ions on Gold and Uranium Nuclei,"
papers submitted at the A-U Conf. on i~uclear Reactions in "edium and Low Energy
Physics, Moscow, 19-27 Nov 57.

V-
FLEROV, G. V., KLOGFIOV- D. S., SKOB-"-,-Li:, V.
(Acad. Sci. USSR)
"on the Stability of Proton,"
paper submitted at the All-Union Conf. on Nuclear Reactions in I-jedium and Low
Energy Physics, Moscow, 19-27 Nov 57

L L 1--c! V,
,A~FPIIIOR BARABOSMINI S.A., KIILI~ YA1

IftTLE im
Interaction Between 11itrover a Voott 56-6-4/56
(Vzaimodeystviye yadei az ota -3 yadrazJ zzolota -Ru-- ~ ian)
~LRIODICAL Zhurnal FI,-sperim.i Teoret.Fiziki,1957,vol 32,Nr 6,.pp 1294-1297
(U.S.S.R.)
ABSTRACT By using the scarce of mL~lti-ply charEed ions developed by Morozov
(Atomnaia ene--giia,Vol 3,p 272(1957)) the authors obtained by means
of the 150 cm cyclotron of the Academy of Science an intense bundle
of monoenergetic ions of five-fold charged N14 Tith the energy of
115 KeV.Thie bundle was used for the following purposes; 1) Inve-
stigations of the dependences of the cross sections of the reactions
Au(14,4n), Au(N,5n) and Au('11.6n) on the energy of the nitrogen ions.
Determination of the absolute cross sections of these reactions.
3 Determination of the principal mechanism of the interaction of
fl
heavy ions with gold naclei.On the occasion of these experiments
stacks of from 10 to 15 nickel foils with a thin coating of gold
were irradiated.After irradiation the a-activity of the foil was
determined by means of a photom7altiplier with ZnS crystal and by me-
ana of an amplitude discriminator.The reactions were determined ac-
cording tothe half-value periods of the a-active isotopes concer-
ned.
The thus obtained aependences of the cross sections of the above
mentioned reactions on the energies of the nitrogen ions are illu-
strated by a diagram.The characteristic course taken by the curves
Card 1/2 with the maxima is due to the presence of competing reaftions (with

56.6-4/56-
Interaction Between Nitrogen and Gold .-i'uclei.
emission of a different n=ber of neutrons) and also to the fission
of the composed nuelcus.The sharp decrease of the cross section of
the reaction (11,40 at energies of more than go 1.:eV is explained by
the fact that within this ener_qj dotain the reactions with an erqi-
ssion of 5 neutrons predominate.Ir, a similar manner also the de-
crease of the cross section of the reaction (N,3n) and (N,6n) at e-
ner-ies of more than loo and 11o 1-eV reppectively bay be explained.
The curve for the dependence of the sum of the cross sections of
all reactions (with emission of neutrons) upon the energy of the ni-
tro6en ions hau also a characteristic maxinum.
(3 illustrations)
~'LS2CCTATICjr
PR_~,1SENTLD -BY
51131,'ITTED
AVAIIABLE
Card 2/2
1,0t t~iven.
21-1-1957
Library of Congr03S.

F~_ t~ /Ul/
.AUTHOR DRUIN4 V.A.,POLIYAIIOV) S.~!-,_ILLZ
TITLE Ruclear Fission Induced by Accelerated D-itrozen Ions. 5&6 5/56
(Beleniye yader pod deystvi~-em uakorenn~*kti ionov azota -11assian),
PERIODICU Zhurnal Eksperiia.i Teorut-Fiziki,1957,1101 32,11r 6,pp 1298-1304
ABSTIACT The introduction contains a short report on the stage to which the
problem has hitherto developed.The present paper deals with the
determination of the fission cross section of -U235,U23f3,Bi,ALx,Re
and Yb under the influence of accelerated nitrogen ions In dependen-
ce on the energy of the nitrogen nuclei.
Uperimental technology: The nitrogen ions were accelerated by means
of a cyclotron with a pole diameter of 150 cm.The fission fragments
were observed by means of an ionization chamber.Also the recording
of nitrogen ions and the experiments on the exterior bundle are dis-
cussed.The targets consisted of aluminum disks of 14,,ttthickness u-
pon which the layers of the substance tobe investigated are applied.
ExRerimental resultsiThe here obtained data concerning the fission
cross sections of Ur351U238,Bi,Au,Re and Yb at different energies of
the nitrogen nuclei are illustrated in form of diagrame.Also the
statisticalmeasuring errors are shoin in these diagrams.
Discussion of resultes When analyzing their experimental resultst
the authors based upon the fact that before the process of fiesio-
ning a highly exaited nucleus with known values of the excitition
Card 1/2 energy and of the parameter Z2/A are formed.Experimental investi-

ASSOCIATION
FRESEMED BY
SUBMITTU
AVAILABLE
Card 2/2
Nuclear Pission.Induced by Accelerated Nitrogen Ions -.92921M
gations of the interaction between the accelerated nit-46-
and U235 and U238 nuclei showed that the products of tho-se reactions
at which there is no fission are created with a probability that
is considerably lower (by about loo times) than fisaion.The data
obtained here make it possible to estimate the upper limit of the
fission cross section of the uranium nuclei in consideration of
their Coulomb excitation on the ocoasion of interaction with the
accelerated nitrogen ions.Several special results are then deeLt
with.
(5 illustrations)
Not Given.
12-1-1957
Library of Congress.

56-2-4/47
AUTHra GERLIT,, Yu.B., GTJSV,7A L.T., MYABOYEVV~B.F.s TARAr,,TIII$ N.I.,

,, K.'V. 71MM" 0 M.
_1 ~ 0
FILIPFOVA $
-TITLE _
Yield of Californium isoropt~s rroauced in the interaction between
Carbon Isotopes and Uranium Nuclei

ERIODICAL (Vy)diody isotopov kaliforniya v reaktsjyakh vssimodeystviyabnov
ugleroda a yadrami urana. Russian)
Zhurnal Eksperim. i Teoret. Fiziki 1957, liol 33, Ur 2 (8), pi, 339 -
- 342 (U.S.S.R.)
ABSTRACT In a 67 cm cyclotron four-fold 'charged carbon ions are acaierated up
to go MeV. With this energy they inpinge upon a thick uranium target
and cause the reaction U(Cs n)Cf. The absolute yields per impinging
carbon ion and the following reactions are:
U239 (C12, 4n) Cf 246 1,5 - 10-9
239 245 -9
U (C-14, 5n) Cf 3,0 . 10
U239 (Cia , 6n) Cf L44 4 9 . 10711

ard 1/2 The fissioning of uranium bombarded with carbon was found to be
~,8 . 10 3 times more probable than the 2Waporation process of neu-
trons from the intermediary nucleus Cf -'70 .

5&,~4/47
Yield of Californium Isotopes Produced in the Interaction betvieen
Carbon Isotopes and Uranium Nuclei
(With 1 table and 4 illustrations).
ASSOCIATION Academy of Sciempsof tht- USSR
( Akademiya nauk WM)
'PRESENTED BY
SUBMITTED 5.)-1957
1.1,VAILABLE Library of Congress
Card 2/2

AUTHOR: PARFANOVICHD.M., SEKCHIKOVAA.M. j FLEROVA.N. 56-2-5/4T
TITLE; Determination of the Range-Energy Relatro-n for Nitrogen and
Oxygen Ions in Photographic Emulsions. (Opredeleniye- ~zwoiiimoOA
probeg-energiya Alya ionov azota i kisloroaa v fotoemulsii~,
Russian)
PERIODICAL: Zhurnal Eksperimi Teoret.Fiziki, 1957, Vol 33, Nr 2, PP 343-345
(U.S.S.R.)
ABSTRACT: In a 150 om cyclotron ions are first accelerated as doubly-ohargea
ions, and they leave the cyclotron as six-fold charged ions. For
monochromatization and after traversing an Al-filter of 5t4'thiok-
ness, they pass through a magnetic analyzer in the focus of which
the photoplates are located. By means of this arrangement the range
energy curve for nitrogen and oxygen was recorded within the
energy range of from 3 to 120 MeV on Ilford E-i plates. The aocur-
acy with which each point on the curwe was determined for ions
with an energy exceeding 30 MeV amounts to 5%, and for ions with
a lower energy it amounts to 10%. (With I Illustration).
ASSOCIATION: AcadenW of Soienceal-of the U.S.S.R. (Akademila, nax*SSSR)
PRESENTED BY:
SUBMITTED: 8.3-1957
AVAIIABLE: Library of Congress
Card 1/1

F L LIV cr
AUTHORSt Volkov, V.V.j Pasyuk, A.S., Flerov, G.N. 56-3-7/59
TITLEt Evaporation Reaction in the intbraction-of Accelerated Nitrogen
Ions N14 with the Nuclei of Some Slements
(Reaktsiya "aryva" pri
j
vzaimodeystvii uskorennykh ionov azota NI yadrami nekotorykh
elementov)
PERIODICALt Zhurnal Eksperim. I.Teoret.Fiziki, 1957, Vol. 33, Nr 3, PP. 595-6o1
(USSR)
ABSTRACTs N14- ions are accelerated in the cyclotron up to~--Ioo MeV, after
which they penetrate through Al., NIA., Gu, Ag, Cd, Sn- foils, on
which occasion radioactive N13 was found.
Measuring of angular distribution showed that N13 emerges only with-
in a very narrow angular ranoe. For Al 230 + 80 was measured as the
-
nted to 67 MeY.
most probable angle, where N14_ energy amou
The cross sootion for the evaporation reaction in the case of a N14
-energy of " 85 MeV amounted to 3o mb for Ni and 12 mb for Al.
There are 5 figures and 2 Slavic references.
ASSOCIATIONi AN USSR (Akademiya nauk SSSR)
SUBMITTEDe March 19p 1957
AVAILABLEt Library of Congress.
Card 1/1

FLEROV-G.--N.-and-POLIKHANOVI-S*--Mo- - ---
--=A=NM *==Nw--
"Nuclear Reactions Induced by Heavy Ions."
paper to be presented at 2nd UN Intl.' Conf. on the p w eful uses of Atomic
Energy,, Geneva,, I - 13 Sept 58.

Al,
AUTHORS: Tarantin, ff. I., Gerlit, Yu. B., Guseval L. I.p 56-2-7/51
Myaaoyedov, B. F., Filippova, K. V., Flerov, G. 11.
TITLE: The Mass Distribution of Fission Products Produced by the
Irradiation of Gold and Uranium by Nitro.en Ions
(Raspredeleniye po mamsam produktov deleniya,
obrazuyushchikhsya pri obluchenii zolota i urana ionami
azota)
PERIODICAL: Zhurnal Eksperimentallnoy i Teoretioheskoy Fiziki, 1958,
Vol 341 Nr 21 PP 316-321 (USSR)
ABSTRACT: The present rork investigates the mass spectrum of the
fission fragi-.1ents of radon and einsteihium which are formed
in the irradiation of gold and uranium with nitrogen ions.
Pirst the exnerimental method is discussed. Gold- and
uranium plates of a thickness of 30 g were irradiated with
five-times charged nitrogen ions from a slit source at the
inner ray of an 150 cm cyclotron. The energy of the nitrogen
ions was 115 MeV. After the dissolution of the irradiated
target the different radioactive elements on the
Card 1/3 corresponding carriers were dissolved. The radioactive

The Mass Distribution of Fission Products Produced by the 56-2-7/51
Irradiation of Gold and Uranium by Nitrogen Ions
isotopes were identified according to their half life. The
relative yields of the nuclei identified this way are
listed in a table. A dia-ram shows the yields of the nuclei
given in this table as a function of the mass number A. The
main part of the yield of fission products is concentrated
within a comparatively narrow interval of mass numbers. The
yield of fission fra6ments increases rather Greatly with an
increase of the mass number froa 70 to loo, and with still
greater mass numbers it decreases to the same extent. From
the experimental values of the yields of single nuclei the
total yields of the correspondinC mass series (massovaya
tsepochka) were computed. The additional taking into account
of the yields of nuclei not identified in these experiments
changes only little the character of the distribution of
experimental points. The curve of the distribution of
fission fragments in relation to the mass with the values
A - 85 to 115 has the shape of a narrow peal: with a half
width of about 2o mass units. The yields of Ga72,73, Se123,
Sb122 and the yields of tho aeries of decays corresponding
to these nuclei do not coincide with the monotonous course
Card 2/3 of the curve and are a little greater as normal. About 2o

the Mass Distribut:i(M of Fission Products Produced by the 56-2-7/51
Irradiation of Gold and Uranium by Nitrogen Iona
different isotopes were identified amon6 the fission
products forming in the irradiation of uranium with nitrogen
ions. The yields of the accumulated nuclei are collected in
a table. The fission of nuclei under the action of heavy
particles can be represented by the following scheme:
Formation of a compound mucleus, emission of neutrons and
fission. The half width of the curve of the distribution of
fission fragments on the mass is considerably smaller in the
fission of radon than in the fission of einsteinium. There
are 2 figures, 2 tables, and lo references, 4 of which are
Slavic.
SUBMITTED: August 2o, 1957
AVAILABLE: Library of Congress
1. Gold-Irradiation 2. Uranlwa-Irrrdiation 3. Nitrogen ions-
Applications 4. Isotopes-Determination
Card 3/3

JTHORS: ing Member AN USSR, 20-1-19/58
Jbxzxt__G_.__Kt', Correspond
Klochkov, D. S., Skobkin, V. S., Terentlyev, V. V.
"ITLE: 232
The Spontaneous Fission of Th the Stability of
Nucleons (Spontannoye deleniye Th i stabillnost' nuklonov)
ARIODICAL: Doklady AN SSSRo 1958, Vol- 118, Hr 1, pp. 69-71 (USSR)
ABSTRACT: First the authors shortly report on respective earlier works.
Many a thibg spoke in favor of the determinacy 2n of the half-
life period of the spontaneous fission of Th by means of
an essential increase of the sensitiveness of the method.
Such an increase of the sensitiveness can be reached by an
increase of the total quantity of experimental material as
well as by a decrease of the background. The advantages of
proportional counters are mentioned. The counters used here
were produced of thin aluminum tubes. Thorium was deposited
in form of ThO wi th bakelite lacquer on inner surface of
the semi-cylingrical grooves-in the cathode of the counter.
As anode served Nichronium wires with a diameter of 50
The counters were filled with methane and had a wide
proportionality range. For the increase of the total quantity
of the experimental material some counters of the same type
Card 1/2 were used. Special attention was paid to the decrease of the

The Spontaneous Fission of Th 232 and the Stability of Nucleons 20-1-19/58
background. Possible reasons for errors e. g. neutrons, are
pointed out. From the measurements discussed D3je the
following results: the half-life period of Th is (if 21
thorium suffers a spontaneous fission at all) more than lo
years. If we accept the condition that thorium nuclei, because
of the decay of a nucleon, are divided into ligh~lr particles
the life of the compound nucleon is more than lo years. By
means of the here discussed method for the registration of
rare fission acts the authors also searched for transuranium
elements in monazite minerals. For this purp se monazites from
different deposits of an age of more than lo9 years w9re in-
vestigated. For the plutonium content a value of