The 4000 Curie Cobalt 60 Therapy Installation at Radiumhemmet

Individually Designed Filters in Cobalt 60 Teletherapy

“…Careful measurements were performed with the so-called Bg-chambers, with an external diameter of 0.5 cm and a length of 2 cm, to check that in the above measurements no systematic error had been present. The measurement accuracy with these chambers is considerable and the wavelength dependence is small, as has been shown by SIEVERT (1934), SKOLDBORN (1959) and by DAHL and VIKTERLOF (HULTBERG et coll. 1959).…”

The Swedish Gamma Radiation Standard Laboratory

“…The results were reported in separate papers (ref. 2,11). The calibration factors of the cavity standard chamber unit for the C060 gamma radiation were for the first series: 0.212, 0.212, and 0.211, respectively, and for the second series: 0.215, 0.214, and 0.214, respectively, making a total average of 0.213 0.9 %.…”

“…This was the prototype of the gammatron 1, and was described in detail in a separate book (ref. 2). As a great number of these units and modified ones, such as the gammatron 2, were expected to be installed at other radiotherapy centres, it was considered desirable that the manufacturer be able to measure the radiation output from all such units from a common standard.…”

“…A well (1) is arranged in the sand below the floor; this well is 2.5 m deep and 1.1 m in diameter and is provided with a cover of iron-ore concrete extensively reinforced with iron rods. The gamma radiation beam from source container (2) is directed vertically downwards and passes through a hole in the cover, the well serving to receive the radiation as it travels downwards into the sand. The bottom of the well is positioned at a distance of 3.8 m from the sources.…”

“…The multisource head and the gamma radiation sources. The multisource head, (2) in Fig. 1, employs lead as protection material and weighs about 900 kilograms.…”