ML20217H889
| ML20217H889 | |
| Person / Time | |
|---|---|
| Issue date: | 03/16/1998 |
| From: | Steven Baggett, John Lubinski NRC |
| To: | |
| Shared Package | |
| ML20217H882 | List: |
| References | |
| SSD, NUDOCS 9804060105 | |
| Download: ML20217H889 (6) | |
Text
RsGISTRY OF. RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION 0F DEVICE 1
NO.r.NR-8101-Dh801-S DATE:
M Mt l' 6 199 L PAGE 1 OF 4 DEVICE TYPE:
Rotational Teletherapy Unit MODEL:
Toshiba RCR-120 MANUFACTURER / DISTRIBUTOR:
Litton Medical Products, Inc.
Profexray(Division 515 E.
Touhy Avenue Des Plaines, IL 60018 SEALED SOURCE MODEL DESIGNATION:
GE Drawing 106D3949 ISOTOPE:
MAXIMUM ACTIVITY:
Cobalt-60 9700 Ci (358. 9 TBq)
T.EAK TEST FREOUENCY:
6 Months PRINCIPAL USE:
(C) Medical Teletherapy CUSTOM DEVICE:
YES X
NO 9904060105 900316 PDR RC SSD_
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE PAGE 2 OF 4 NO.: NR-8101-D-801-S DATE:
MMR 161998 DESCRIPTION:
The Toshiba RCR-120 was a rotational teletherapy unit with the head and beam barrier on a "C" arm which rotated about the patient.
The unit.could be obtained with a source to center of rotation distance of either 65 cm (25.59") or 80 cm (31. 5").
The iron beam stopper subtended an angle of 90 (65 cm) or 75*
-(80 cm) from the patient and attenuated the beam by a factor of
- approximately 104 The unit could be ordered with a counterweight instead of the beam stopper, if so desired.
The unit was 6'6" (1.98 m) high with a maximum source-floor distance of 5'7" (1.70 m).
The distance between the source and the back of the unit was 7'4" (2.24 m).
The unit was normally supplied with a standard head designated as "Toshiba C."
This head consisted of a spherical cast steel shell filled with lead.
A tungsten alloy sleeve inside the head
.provided additional shielding in the "off" position.
A 1.9" (4.83 cm) in diameter by 8.3" (21.08 cm) long cylindrical source drawer made of tungsten alloy fitted horizontally into the lead turntable shutter.
The teletherapy capsule was held in the source cavity, which was 30 mm'(1.182") in diameter by 34.5 mm (1.36") in height, of the drawer by a. threaded cap and metal retaining hoop which were placed into position inside the hot cell.
The shutter rotated in a horizontal plane from the "on" position to the "off" position byLan electric motor working against a torsion spring.
In case of power failure, the shutter would return-automatically to'the "off" position.
The tungsten alloy collimatica assembly defined a field size which could be varied from 2 cm*- (0.31 in2). to 18 cm2 (2.79 in8) for the 65 cm treatment distance (about 16 maximum subtended angle)~, or from 2.46 cm2 (0.38 in2)'~to 22.15 cm2 (3.43 in2) for
}
the:801cm treatment-distance (about 15.5* maximum subtended angle).
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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY. EVALUATION OF DEVICE _
PAGE'3 OF 4 NO.: NR-8101-D-801'-S DATE:
M 1 6 1998 DESCRIPTION ( Cont ' d) '-
The head swiveled 165".in either direction and tilted 130 forward from the downward position ~and 30 back.
Beam orientation could be limited by electrical or mechanical stops.
Lights on the unit and on the control panel indicated the "on" and "off" conditions.
A red knob protruded upward from the
.c_
- treatment. head to indicate mechanically and visually when the source..was in the "on" position.
The turntable shutter retracted to the'"off". position by the return spring when the power failed or'when the interlocked door was opened; the unit had to then-be
{
reset to continue treatment.
In an emergency, the shutter could
{
be mechanically rotated-to the "off" position by engaging and emergency handle with the shaft of the shutter located at the top of'the unit.
The model identification number contained the following information:
Ex:
Toshiba (treatment head)
C-2
-R-F-80 - B 1-standard collimator 2 - simplified conformational collimator j
R-- rotational unit S
'floorstand unit
-M - movable head F - fixed head
]
' 6SI-SAD in cm:
!80 SAD in cm i
A'- beam barrier B -' counterweight l
b i
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE PAGE 4 OF 4 NO.: NR-0101-D-801-S DATE:
pgg gg EXTERNAL RADIATION LEVELS:
The unit loaded with 3,000 curies (111 TBq) of cobalt-60 (3,100 rhm) was surveyed by the manufacturer and found to have an average and a maximum radiation level at 1 meter from the source of 0.57 mrem /hr (5.7 ySv/hr) and 0.95 mrem /hr (9.5 pSv/hr),
respectively, with the cource in the "off" position.
Beam "on" leakage was less than 0.01%.
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
As of the effective date of this document, the Model Toshiba RCR-120 Rotational Teletherapy Unit is no longer manufactured and distributed.
However, it may still be approved for licensing purposes.
REFERENCES:
This registration certificate supersedes NR-421-D-101-U dated February 5, 1969 and is based on information included in that certificate.
ISSUING AGENCY:
U.S.
Nuclear Regulatory Commission
/J
//
Date:
Reviewer:
'/JohnW.
Lubinski
/
[A Dsd
\\
MAR 161998 Date:
Concurrence:
c.7
"' Steven L. Baggett
PAGE1 Q
NRC FORM 567 U. S. NUCLEAR REGULATORY COMMISSION
/
l g
REQUEST FOR A SEALED SOURCE OR 17 '-
DEVICE EVALUATION INSTRUCTIONS: Send this request AND a copy of all reisted letters /applicehone and drawings to: The Sealed Source Safety Section, ATTN: Chief, OWFN Mail Stop 6 H3. Change the License Tracking System rnilestone to 19 and sosign to reviewer code I-5.
NOTE: Retain a copy of this request with the application and background flies.
REQUESTEH REGION / LOCATION:
A.)
/)/w/i( A /
f [ Gen g /j ]I 11 Ill IV V R HQ R LFDCB
._ j TELEPHONE NUW8ER DATE TYPE OF ACTION REQUESTED (Check as -_,,,,, W e
APPuCANrs NAME SOURCE REVIEW AMENDMENT OF REGISTRATION SHEET NUMBER (S)
Mast CONTROL NUMBER (S)
DEVICE REVIEW k)(?-y2l-3 ~lDI" N LETTER /APPuCATION DATE UCENSE NUMBER (S)
CUSTOM REVIEW Al 8 % * -T) - 4 " } ~ k Il h 9 / 9 4 fM exA'Ay 3;v'<Lud S}f E. Toudy 5 hs P/n;ws, D
& m/d FOR SSSS USE ONLY ret *lEWER
/
MODEL NUMBERS
, NUMBER ASSIGNED gfdL
~TOS h i h A EC/2 - /d O
~
DAMECElvED DATE ASDGNED
/
OATE TO FEES n M Ic?,
//Xb/f'8 n/rl9 7 TYPE OF ACTION (6tdicate flie number of each type)
/
l COMMERCIAL DISTRIBUTION (FORMAL) l USE BY A SINGLE APPLICANT (CUSTOM)
SOURCE (9C)
DEVICE (9A)
SOURCE (90)
DEVICE (98)
[pW
]
]
NEW NEW NEW
[
AMENDMENT v AMENDMENT AMENDMENT AMENDMENT d NO SAFETY EVALUATION REQUIRED j LICENSING ACTION REQUIRED IF KNOWN NO NO FEES REQUIRED
) OTHER (Specny)
TOTAL NUMBER OF NOTES REVIEW HOURS g4 NUMBER OF DEFICIENCY LETTERS NUMBER OF DEFICIENCY CALLS FOR B8LLING PURPOSES ONLY N
REGISTRATIOW j PRODUCT INACM -
NAME CHANGE ADDRESS CHANGE ADD TO BILLING REMOVE FROM BILLING FOR FEE USE ONLY TYPE OF FEE FEE CATEGORY b
/
] 9A 98 9C 90 p \\/ gby,,.c /
- AS REQUIRED ACDUNT RECENED CHECK NUMBER y
MATANN UPDATED
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TSYS PDATED DATE cHMCK LOG
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cP#
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COMMENTS NRC FORM Sei (443)
" * = = = = =,,
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