3156
therma’ Oux {a the central zone of the beem of 1.25 108 8. em
acc ' and for a fast reutron Mux of 2.25 « 10! a. cm”', was found
to be (al dowe due to the reaction 'N(n,p}C - £75 mrad/min; (b)
dose doe to capture gammas: 180 mrad/min; {c) dope due to direct
gamma radiation : 8 mrad/min; (d) dose dua to fast neutrons : 55
mrad/min. (France)
31902
(CEA-R-3994)
DOSE ABSORBEDIN BIOLOGICAL
TISSUE UIRADIATED BY FAST MONOENERGETIC NEUTRONS,
Sklavenitis, Helene; Devillers, Christlan (Commissariat a l'Energie Atomique, Fontenay-aux-Rosea (France). Centre d'Etudes
Nucleaires). Apr 1970. 3937p. (In French). Dep. CFSTI (U.S.
Sales Only),
The done absorbod th an irradiated biological tisaue equivalent
medium is calculated with a view to carry out radioactiyation
quantitative analysia with fast monoenergetic and unidirectional
neutrons The results are compared to those of a similar American work at energias of 10, 2, and 0.5 MeV The method ia then
applied to neutrons of 14.75 and 36 MeV. (France)
31983
(CISE-N-128) EXPOSURE OF CHILDREN OF 18
YEARS OF AGE TU IONIZING RADIATION. Bazsano, E.;
Ghisland|,E. (Centro Informastoni Stxit Esperienze, Milan
(italy)). Sep 1969. 14p. (in italian). «CONF-€90929-1).
Dep, CFST1 (U.S, Sales Only}.
From 15th National Congrees of the Italian Association for
Health Physics and Protection against Rediation, Cagliari, Italy,
The particular aspects of the exposure of 18-year old minors
to ingizing radiation both from professional activity and from
study end training were considered After a diecuasion of the
motives for which beth the Eurstom Standards and the lews of
many countries (of which Italy ia one) prohibit the profeestonal
exposure of such persons, the problense of students. especially
those in nuclear engineering schools, who participete in exercises with radiation sources and ia periods of practical isetrection
at nuclear installation®s, are examined. The criteria that can be
Iollowed to establish the dose limites to which theee students can
be exposed are examined frou the
of « rigorous radioprotection. (tr-auth)
aise
(DOCKET-50201-26) [WEST VALLEY REPROCESSING
PLANT|. Environmental Radioectivity tn New York Rate, 1968,
(New York State Dept. of Health. Albany). 14 Jul 1969, Zp.
Dep. CFSTI.
31988
(NP-18123} ANNUAL REPORT TO THE DIRECTORGENERAL PCR THE YEAR ENDED 30th JUNE 1369. (Common
weslth X-Ray and Radium Lab,, Melbourne {Australla)). 1969,
42p.
Dep.
CFSTI(t', S. Sales Only).
The historical and present-day responaihilities of the Laboratory are discussed and the developments during the year are reported. Progrese je outlined in the fields of national etandards of
activity of radionuclides and of exposure to x and y radiation, ra-
diation dosimetry, diagnoetic radiology, radivm, radon, radlo-—
isotopes, radlochemisiry and low-level measurements, whole-
body monitor, radiotogical protection, and film-badge service
Appendixes provide information op statietical data for radiochemistry and low-level measurements, radioisotopes, radon, and
radium, as well as the procedures for procurement of radiciveot pes for medical research tn Australia, (C.0.)
3198s
METHODS OF COMPUTER CALCULATION OF DOSE
DISTRIBUTIONS IN TELETHERAPY. Cunningham, J.R. (On
tarlo Cancer Inet., Toronto}, pp 19-24 of Role of Computers
in Radiotherapy. Vienna, International Atomic Energy Agency,
1967,
From Panel on the Role of Computers tn Radiotherapy, Vienna,
Austria See STI/PUB—203; CONF -670736,
Doge distribution computationa have been carried out for many
years beth for purposes of on-line production of data to be used
directly for patients and to produce atlases and analyses of data,
In thie work, the computer haa hot merely done more quickly what
can be done with a slide rule or a desk calculator, but hae made
poesidi« the inclusion of such facture
aan Ae Lateoe
Vol, 24, Ne. 16
NUCLEAR SCIENCE ABSTRACTS
ma, fot example, three-
dimensional representations and allowances for tiesue inbomogeBeltier The central problem is alwaye the determination of the
dose at any point in an absorbing end scattering medium for a ainaie hram. Multiple-beam distributions are combinations of singfe
beamea, The alngic beam hae been represented by digitized Inadone
data, rhvenptrical generating functions, or by uae of decrement
fInese. rt by peparat!. 5 of scattered and primary radiation, There
hastrer Ittle program interchange among workers th this Meld;
~ os
‘try bom followed hia own methode, (be type of program
weet he og frequertty determined by available computer [actlitias,
ete
Ota
att
wey haat tae ee vest need (a for information
eat pee
tro ew
amt
2 engecienta lag
or
so)
OAL ration, eatert: Otemor,
ac
ate abt tte sty de
rection. It ie Ukely that the computer can assist in dealing wih all
these points. (40 referesces.) (auth)
31907
COMPUTER DOSIMETRY FOR INTERSTITIAL AND
INTRACAVITARY IMPLANTATIONS, ASURVEY. Stovall,
Martiyn (Anderson Hospital aed Tumor Inst., Huuston, Tex);
Shalek, R. J.; Peterson, Mary. pp 25-35 of Role of Computers
in Radiotherapy. Vienna, International Atomio Energy Agency,
1967,
From Panel on the Role of Computers in Radiotherapy, Vieana,
Austria, See STI/PUB-203; CONF-670736,
Fourteen digital computer techniques for the dosimetric evalua~
tion of Interetitial and intracavitary applications of sealed radico—
active sources are reviewed; eleven of these programs were de~
signed for routine calculation of dose distribution in individual
patients and three programs are special-purpose. The techniques
used for routine computations are compared In terma of method
of obtaining input data, types of sources considered, method of
caloulation, and form of output data. The similarity between these
methods reveals a fundamental agreement among workers concern~
ing the basic approach to the problem. The principal differences
appear in the form of output data, tut these largely reflect the
hardware capabilities avatlable et various inatitutlons. Five fig-
ures illuacrate some forme of output data in use at present, (37
references.) (auth)
31908
COMPUTER CALCULATION OF DOSE DISTRIBU.
TIONS IN “Co TELETHERAPY. Hi
(Oncological
Inst., Prague); Hrow, M. pO 39-45 of Role of Computers tx
Radiotherapy, Vierma, Interwations! Atomic Energy Ageacy,
1967,
From Panel oa the Role of Computers in Radlotherapy, Vieuna,
Avatrie, See STI/PUB-203; CONF-670736.
The use of Rerling’s non-linear equation for the calculation of
two- and three~dimensional dose distribution ig briefly described.
The role of the sigma constant, 2 function of penumbra width, as it
affects the conatruction of a “Co unit le discussed. Dose distritu~
tlona as calculsted with a Gler computer are preecated. (46 references.) (auth)
s1989
AN IMPROVED MODEL FOR RECTANGULAR ®Co
GAMMA RADIATION BEAMS IN UNIT-DENSITY MEDIA. Van
de Geljn, J. (Ziekeobuis van deo H. Johannes de Deo, The Hague}.
pp 47-31 of Role of Computers in Radiotherapy. Vienna, Inter-
in Radiotherapy, Vienna,
Austria, See STI/PUB-203; CONF-670736,
A point-source model for rectangaiar "Co beam y dose diatribution ln a water-equivalent medium proved to be eufficiently accurate for clinical purposes. The principal shortcomings of this
model occurred tn the regton of the beam penumbra near the surlace of the medium. A description ls given of a relatively simple
Improvement of the model. It Le baged on an analyals of the geometry of the source, coliimator walla, aperture, and patient (or
phantom). The new model provides a reasonably accurate quanthative description of the behavior of decrement lines, based on
computer calculations of dose distribution. (C.H.)
31990
BEHAVIOUR OF ZONAL INTEGRAL DOSE IN HIGHENERGY MOVING-FIELD TELETHERAPY. Van de Getjn, J,
(Ziekenhuis van den H. Johannes de Deo, The Hague). ppos-—
66 of Role of Computers in Radiotherapy. Vienne, Interpationsnt
Atomic Energy Agency, 1947,
From Panel on the Role of
ra in Radiotherapy, Vienna,
Austria. See STUPUB- 203, CONF-670736.
Some Initial resulta are reported on the use of two parameters
which may be useful in }
the relative quality of treatment
plans and the relative merits of high-energy radiation machines
uaed for moving-fleld y therapy. These two parameters are ronal
integral dose and sonal surface area. These concepts are based
on a compariaon of the dose to the target volume with the dose to
a certain critical region surrounding it, using computer caleulatlons, Attentlon is limited to a few moving-ficd techniques, where
the target volume te defined by the 80% isoduse surface. In the
tiseue surrounding the target volume, the 60 to 70% and 70 to 80%
regions were Investignted. Some results are given on the effect of
fied size and other factors for four different teletherapy machines:
three “Co units and one linear accelerator. Performances of thee
marhinea are compared, (C.H.}
3199)
TIONS,
PROGRESS IN OPTIMIZATION BY SCORE FUNC-
Hops, C 8,
(Weetern Regional Hospital Posrd, Glas-
pew); Laurie, J: Orr, J. 8.; Halnan, KE,
Role of Computers tn Radiotherapy,
Atomic Energy Agency. 1867
pp 67.9 of Role of
Vienna, internationsl
Fro Ta clon the Role of Comprters in Radtotherupy, Vieans,
not
“TE OU B-203; CONF 670734,