Radiation safety@isac saferib workshop cern oct 30 nov 1 2002
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Radiation. Safety@ISAC SAFERIB Workshop CERN, Oct.30-Nov.1, 2002. L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 Lutz.moritz@triumf.ca. Overview. Short description of ISAC Shielding (tools and verification) Activation (yields and distribution) Target handling

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Radiation safety@isac saferib workshop cern oct 30 nov 1 2002

Radiation.Safety@ISACSAFERIB WorkshopCERN, Oct.30-Nov.1, 2002

L. Moritz

TRIUMF

4004 Wesbrook Mall Vancouver, B.C. V6T2A3

Lutz.moritz@triumf.ca


Overview
Overview

  • Short description of ISAC

  • Shielding (tools and verification)

  • Activation (yields and distribution)

  • Target handling

  • Contamination control

  • Experience and plans for future


Isac parameters
ISAC Parameters

Reference Design:

100 A of 500 MeV protons on

95 g cm-2 UC2

Authorization:

100 A of 500 MeV protons on targets

Z  82

Application for targets with Z > 82 in preparation

Ottawa



Isac at triumf
ISAC at TRIUMF

http://www.triumf.ca/isac/is9-00-t.jpg




Isac target stations
ISAC Target Stations

RIB

Initial Installation:

West Target Station

Installation 2002: East Target Station

500 MeV Protons


Shielding
Shielding

  • Bulk Shielding: Point source, line-of- sight attenuation

  • Complicated geometries: FLUKA

  • Verification: MCNP, LCS


Point source line of sight attenuation of prompt radiation field
Point Source, Line-of-sight Attenuation of Prompt Radiation Field

Nuclear interaction probability

Geometry factor

High-energy neutron yield

Exponential Attenuation

Angular dependence


Parameters f n e p h 0
Parameters f Fieldn(Ep), h0,, 

Nuclear interaction probability, fn

Source term, h0

m=0.8

Angular dependence, 

Attenuation

length, 


Test 500 mev proton beam stop
Test: Field500 MeV Proton Beam Stop

1.8 m

2.9 m


Isac target shielding plan
ISAC Target Shielding (Plan) Field

Concrete

(low Na)

Radioactive Ion beam

Concrete

Steel

Slits

A

Cu Beam dump

A’

Target

Proton beam


Isac target ion source shielding

0 Field

1m

ISAC Target/ion Source Shielding

concrete & steel

(Section AA’)

Service space

concrete

vacuum seals

steel

steel

steel

target

ion beam

recycled steel


Streaming through pre separator maze

FLUKA simulation Field

Streaming Through Pre-separator Maze

Target: 50 g cm-2 UC2

Ep = 500 MeV

Ip = 100 mA


Pre separator maze

Before Field

Pre-separator Maze

Added shielding

After



Target module service ducts
Target Module Service Ducts Field

Target/Ion Source


Streaming through target vacuum exhaust ducts

Sv/h Field

Streaming Through Target Vacuum Exhaust Ducts

Concrete-

steel

Air

Target: 50 g cm-2 UC2

Ep = 500 MeV

Ip = 100 mA

steel

p


Streaming through ducts
Streaming Through Ducts Field

Concrete-

steel

Air



Radiation fields above target

FieldSv/h

1000

350

400

200

105

100

10

140

170

200

115

1

Radiation Fields above Target

Andersson-Braun Measurement

100 A on Mo Target Test


Activation
Activation Field

  • Experimental Cross-sections

  • Silberberg & Tsao

  • FLUKA, LAHET, MCNPX

  • ORIGEN


238 u p x cross section comparison at 500 mev
238 FieldU(p,x) Cross Section Comparison at 500 MeV

…………

Silberberg & Tsao

LCS

FLUKA

Experimental

Spallation

Fission

Peripheral


Silberberg tsao yieldx
Silberberg & Tsao (YIELDX) Field

500 MeV Protons


Fluka simulation 500 mev protons on uc 2 target
FLUKA Simulation Field(500 MeV protons on UC2 target)

UC2 (5.076 g cm-3)

H2O

p

67 mm

27 mm

Ta

18 cm

p

1.4 cm

UC2 (5.076 g cm-3)


Yields uc 2 target fluka simulation
Yields: FieldUC2 target (FLUKA simulation)

18 cm

500 MeV p

1.4 cm

UC2 (5.076 g cm-3)


Origen build up and decay
ORIGEN (build-up and decay) Field

Beam On

Beam Off


Decays leading to 210 po
Decays Leading to Field210Po

210Po

Long-lived

Not in ORIGEN Library


Isac target handling
ISAC Target Handling Field

Target Maintenance Hall


Maximum g field outside itmh
Maximum Fieldg-field Outside ITMH

~10 Sv/h

@ 1 m

1 mSv/h


Isac target servicing
ISAC Target Servicing: Field

Hot

Target storage pit

Cells

Target storage pit

Hot

Cells






Contamination control
Contamination Control Field

  • Ventilation System

  • Production of Radioactivity in Air

  • Typical Release Rates

  • Production of Volatile Radioactivity

  • Vacuum Exhaust Handling


Ventilation system

Secondary Filters Field

Primary Filters

Ventilation System

Stack

Air pressure depression

relative to outside

Fan

Standby Fan

Target

Service

Space

Presep.

Cave

Mass

Separator

Room

Experimental

Hall

Services

Hot Cell

Service

Room

Hot Cell

Target Maintenance Hall



Production in pre separator vault
Production in Pre-separator Vault Field

(3000 hours per year, 100mA on 238UC2 target)


Production in target service space
Production in Target Service Space Field

(3000 hours per year, 100 A on 238UC2 target)


Releases to atmosphere gaseous 2001
Releases to Atmosphere Field(Gaseous, 2001)


Production of volatiles
Production of Volatiles Field

Cl/Ar

b+

Ne

Target

I/Xe

Hg

Rb/Kr

volatiles


Vacuum exhaust system

MP Field

Vacuum Exhaust System

MP

TP

TIS

MP

HEPA filter

TP

TP

Exit modules

TP

Operating storage

Charcoal filter

TP

TP

Pre-separator

Secondary

Slits

Primary

MP

TP

Mass-separator

Long-term storage


Releases to atmosphere particulates 2001
Releases to Atmosphere Field(Particulates, 2001)


Experience
Experience Field

  • Contamination Issues

  • Collective Dose


One contamination incident june 2000
One (!) Contamination Incident Field(June 2000)

Hot Cell

Target Station

Nb target

1

Ta target

2

No contamination after step 1

Uniform contamination after step 1

No other significant contamination

since June 2000


Triumf collective dose
TRIUMF Collective Dose Field

So far ISAC has had no significant impact on TRIUMF collective dose

Start of ISAC operation


Future plans
Future Plans Field

  • Task Force to pursue licensing for actinide targets

  • Proposed test station to measure yields and transport properties of alpha-emitters

  • Proposed second proton beam line to feed second target station



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