Radiation - GE Amersham Typhoon Operating Instructions Manual

2.1

Radiation

Radiation hazard prevention
This instrument is not equipped with any radioisotope or radiation generating unit, and
is therefore not regulated by radiation hazard prevention laws. However, the instrument
is capable of scanning storage phosphor screens which may be polluted by radioisotopes.
Controlled area
Paragraph 1 of Article 1 of the Law Enforcement Rules for Prevention of Radiation Hazards
due to Radioisotope and so forth (Prime Minister's Office ordinance No. 56) defines the
controlled area as "a place where the dose equivalent related to external radiation ex-
ceeds the dose equivalent determined by the Director General of the Science and
Technology Agency (hereinafter referred to as the Director General), the concentration
of radioisotope in the air exceeds the concentration determined by the Director General,
or the radioisotope density on the surface polluted by radioisotope exceeds the density
determined by the Director General."
Limit of superficial pollution
Paragraph 3 of Article 4 of Notice No. 15 of the Science and Technology Agency that
determines the quantity, etc. of radiating isotope specifies that the density of radioisotope
on the surface polluted by radioisotope must be one tenth of the density defined in Article
8.
Article 8 and Table 3 of this Notice define the limits as shown below:
1 Superficial density of radioisotope that radiates alpha rays: 4 Bq/cm
2 Superficial density of radioisotope that does not radiate alpha rays: 40 Bq/cm
Amersham Typhoon Operating Instructions 29193226 AC
CAUTION
If radioisotope (RI) pollution occurs, stop use of the instrument im-
mediately and follow the instructions of your radiation administra-
tor.
2 Safety instructions

2.1 Radiation

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