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Biomedical subjects

J J Fletcher

Publications and source records attributed to J J Fletcher.

6 recordsLinked to original sources

National waste management infrastructure in Ghana.

Radioactive materials have been used in Ghana for more than four decades. Radioactive waste generated from their applications in various fields has been managed without adequate infrastructure and any legal framework to control and regulate them. The expanded use of nuclear facilities and radiation sources in Ghana with the concomitant exposure to human population necessitates effective infrastructure to deal with the increasing problems of waste. The Ghana Atomic Energy Act 204 (1963) and the Radiation Protection Instrument LI 1559 (1993) made inadequate provision for the management of waste. With the amendment of the Atomic Energy Act, PNDCL 308, a radioactive waste management centre has been established to take care of all waste in the country. To achieve the set objectives for an effective waste management regime, a waste management regulation has been drafted and relevant codes of practice are being developed to guide generators of waste, operators of waste management facilities and the regulatory authority.

Ghana

Mental health nurses: guardians of ethics in managed care.

Managed care produces an ethical dilemma for the mental health nursing profession. High costs must be contained and services increased, yet there are ethical costs and risks to managed care. If patient needs are not being met under managed care, nurses have an obligation to try to change those situations. The threat of managed care can be turned into an opportunity and challenge for mental health nurses to maintain long-established nursing values.

Cost Control

Doses from radiocesium and 40K activities found in some tobacco leaves and cigarettes.

It has been found that tobacco leaves and cigarettes contain on the average 1.30 +/- 0.40 Bq.g-1 of 40K which is a beta-gamma emitter. Besides due to the unfortunate Chernobyl accident tobacco leaves may contain 0.04 Bq.g-1 of 137Cs and 0.01 Bq.g-1 of 134Cs depending on their country of origin. From these activities, the annual dose equivalents and the 50 year committed dose equivalents from ingested and inhaled 134Cs, 137Cs and 40K through tobacco consumption are presented.

Canada

Shielding for beta-gamma radiation.

The build-up factor, B, for lead was expressed as a polynominal cubic function of the relaxation length, mu x, and incorporated in a "general beta-gamma shielding equation." A computer program was written to determine shielding thickness for polyenergetic beta-gamma sources without resorting to the conventional "add-one-HVL" method.

Beta Particles

Increase of electrocardiogram voltage and contractile force of the frog's heart induced by chloroquine.

The increase in the amplitude of the E.C.G. and ventricular contractile force induced by chloroquine sulphate was studied in frogs. It was shown that changes originated in the midbrain and were mediated through the sympathetic nervous system. The transmitter was recognized as a beta-adrenergic agent. The possible mechanism of action of chloroquine on the CNS responsible for the phenomenon observed was discussed.

Animals